﻿Original descriptions of Palaearctic species of the genus Plateumaris C. G. Thomson, 1859 (Coleoptera, Chrysomelidae, Donaciinae) and their translations

﻿Abstract Many original descriptions of beetles were published in Latin with specific idioms and technical terms, which are sometimes difficult to understand. The exact meaning of these descriptions is necessary for taxonomic and systematic research. Of the ten Palaearctic Plateumaris species regarded as valid three were described in English, the remaining seven in Latin, French, or German: P.amurensis Weise, 1898, P.bracata (Scopoli, 1772), P.consimilis (Schrank, 1781), P.roscida Weise, 1912, P.rustica (Kunze, 1818), P.sericea (Linnaeus, 1758), and P.weisei (Duvivier, 1885). These seven non-English original descriptions and their translations into English are presented here. Additionally, the translations of the first descriptions of the genus Plateumaris and of its 19 synonyms (some were described in Russian, also) are given.


Table of contents Introduction
Since Linnaeus (1758) many animal taxa have been described in Latin with very specific phrases used in scientific entomological scripts in the 18 th and 19 th centuries, which are not easily understandable for classicists who are not also entomologists.Furthermore, knowledge of the Latin language is in rapid decline.It is no longer part of the education curriculum of grammar schools, but was mandatory in Europe for centuries.Nowadays, English is the worldwide communication language used in science.The second author is a classicist and an entomologist with profound knowledge in systematics who translated numerous original Latin descriptions of Donaciinae taxa in the last years for systematic studies by the first author, such as Donacia clavareaui Jacobson, 1906(Geiser 2019).Many translations are yet unpublished, but were used in Geiser and Jäch (2021).
First descriptions were also given in German, French, or Russian.These languages can be translated by electronic tools into understandable, but not always into directly printable English.However, these means do not offer the possibility to translate Latin into English.The Latin language was used for texts for more than 2000 years, for different purposes: in theology, law, medicine, philosophy, and scientific texts up to the 20 th century, and in all these topics with different grammar and vocabulary rules.Even the Latin descriptions of beetles vary between beetle families.Also, they depended upon the specific education and on the preference of the authors.Therefore, "hand-made" or better "brain-made" translations by a knowledgeable specialist will provide the most adequate results.
In the update of the Catalogue of Palaearctic Chrysomelidae -Donaciinae (Geiser and Bezděk in press; Geiser in press) the first author made many changes concerning the taxonomy and systematics of the Plateu-ZooKeys 1177: 235-258 (2023), DOI: 10.3897/zookeys.1177.103212Elisabeth Geiser & Remigius Geiser: First descriptions of Palaearctic Plateumaris species and their translations maris species compared with the first edition of the catalogue (Silfverberg 2010).These changes are explained in Geiser (2023).For such systematic revisions it was essential to study not only many specimens, but also the original descriptions.
In the genus Plateumaris 80 taxa were described for the Palaearctic region.Ten species names are regarded as valid, the other 70 are synonyms.We provide here the translations of the original descriptions of seven valid species (the other three were described in English) of the genus Plateumaris, and, additionally, of 19 taxa which are regarded as synonyms.These taxa are discussed in detail in Geiser (2023).Some original descriptions in other languages than Latin or English were also translated here into English.All these texts were essential for arguments why some systematic changes, especially synonymisations, were made in Palaearctic Plateumaris species.

Material and method
All original descriptions published in Latin were translated into German by the second author.Then the first author translated them into English.There also exist some original descriptions in German, which were translated into English by the first author.Some original descriptions were published in French, Russian, and Serbian.They were first translated into English by Google translate.Then the translations of French texts were revised together with Gloria Geiser.Translations of texts in a Slavic language were checked with Irmgard Geiser.Some original descriptions are multilingual.They begin in Latin, but often more details are explained in the author's native language.The original orthography of the description is printed here, even though it is now outdated; the translation into English is as accurate and faithful as possible to the original text.The names of the Plateumaris taxa are arranged alphabetically, regardless of whether they are now synonyms or names of a valid species.The Palaearctic species P. akiensis Tominaga & Katsura, 1984, P. constricticollis Jacoby, 1885, and P. shirahatai Kimoto, 1971 are not included here because they were originally described in English.
Text in square brackets contains additions by the authors and is not part of the original description.
Last [sic!] segment of the tarsi longer than the others put together.Elytra extended thorn-like at the apex.Antennae to some extent close together at base.

Plateumaris amurensis Weise, 1898
Described on page 179.The German part of the text is shown in the original but the now-outdated orthography.
the short prothorax subcordate, the disc is rugose and densely dotted, almost dark, at the basis a deep arcuate impression, the middle groove rather deep, anterior angles very small and acute, elytra at apex rounded truncate, with rows of punctures, intervals shiny, lean in transverse direction, hind femora armed with a stout tooth.
Related to Pl. discolor, antennae and pronotum shorter, the latter much more uneven, the former together with the mouth parts, the posterior margin of the abdominal segments and the anal segment pale rusty red.
Pronotum slightly wider than long, the anterior angles form a small but sharp conical edge with bristles, behind it the sides are rounded-expanded, gradually narrowing backwards from ¼ of length, gently flared in the middle.The surface is uneven, densely rugose dotted and more lustrous; it slopes gently inwards to the sharp median groove, which ends with a deep, arched transverse impression before the basis.This creates 2 low tubercles on each side, of which the anterior one is smaller than the one behind the middle.
The elytra are punctured like the weakly sculptured specimens of discolor, the points are sharply engraved, the intervals are shiny and finely wrinkled transversely.The pronotum and elytra are blackish brown with a strong brassy lustre.
A species that stands in the middle between discolor and sericea, since it partly combines characteristics of both.The antennae are remarkably thin, the same form as in sericea, but the segments are broadly annulated in yellow-red.Pronotum as in sericea, but without median line engraved along the centre, and the lateral tubercles quite flat and not shiny, the metallic femora and tibiae from the base almost to the middle yellow-brown, pygidium and apical margin of anal sternite red; coppery, bronze.), but it seems that our species differs according to the author's description by a smaller body and more extensively red-coloured tibiae.
Although the differences now indicated from the East Siberian species are not enough to regard this form as an independent species, the fragmentation of the habitats, the brevity of Reitter's description and the lack of comparison with specimens from the Amur give reasons to consider it as a different species for the time being.

Plateumaris discolor (Panzer, 1795)
Described as Donacia discolor on page 216.Synonym of P. sericea.This variety, which was mentioned by M. Lacordaire as having been found by Dejean in Dalmatia, is distinguished by its entirely black abdomen, legs and antennae.
[Then the very same description is printed in Serbian language in Cyrillic letters.
Only the location data are slightly more detailed]:
legs thick, short, femora swollen; the rear ones with a strong and sharp tooth.

Length 7 mill[imeters]
French English Antennes noires, leurs cinq derniers articles rouges à la base; 3 e article une fois et demie aussi long que le 2 e , plus court que le 4 e .
Antennae black, their last five segments red at the base; 3 rd antennomere one and a half times as long as 2 nd , shorter than 4 th .
Head almost flat, covered with silky, silvery pubescence; very densely and roughly punctate; slightly convex forehead, furrowed longitudinally.

Plateumaris mongolica (Semenov, 1895)
Described as Donacia (subgenus Plateumaris) mongolica on page 267.Synonym of P. weisei.The almost square pronotum is distinctly longer than wide, slightly swollen on the sides just behind the tooth-shaped and slightly outwards protruding anterior corners, and reaches its greatest width there, then noticeably and vaguely slightly narrower towards the base, not sinuated in front of the posterior corners, these (viewed from above) slightly protruding outwards, marked by a bristle-bearing point; the end truncated straight across, the base on both sides very sharply bevelled towards the rear corners; the disc is slightly convex, slightly shiny, not densely (almost scattered in the middle) finely punctured, with extremely tiny and sparse hairs, slightly dented on both sides towards the front angle with extremely fine and rather indistinct wrinkles, slightly in front of the middle on both sides marked with an indistinct shiny tubercle, the inconspicuous or completely obliterated median line deeply depressed and excavated only in front of the base.
The elytra twice as wide as the base of the pronotum, ca.11/3 times as long as the maximum width, very slightly widened behind the middle, then narrowed rather abruptly towards the end, at the end each one individually simply narrowed-rounded, slightly arched on the back, completely without impressions, with rather narrow punctured stripes, the intervals almost flat or hardly slightly arched, densely leather-like, rather dark, the 1 st one (next to the seam) very arched from the end of the extended stripe next to the scutellum, bulging-raised, slightly shiny, the 9 th one forming a podgy fold behind the shoulder; the seam is well folded back at the rear, the lower edge is smooth and shiny; the straight shoulders moderately blunted.
Below, the whole body and also the pygidium are not densely covered with quite long, silky grey hairs.
The abdomen very densely punctured; the basal segment scarcely longer than the following two together, simple: neither indented nor bulging; at the end the anal segment is truncated broadly and almost straight, not indented.
Legs not long, quite strong; the thick femora all very expanded towards the end, the rear ones not or hardly exceeding the rear edge of the penultimate abdominal segment, reinforced below before the end with a strong, broad, triangular tooth that points a little backwards; all tibiae simple, complete, slightly and noticeably widened towards the end, the anterior ones shortly and slightly protruding outwards at the end; the tarsi on the penultimate segment moderately lengthened by lobes.
From Don. abdominalis Oliv.(affinis Kunze) *), to which it is closest, it differs above all by the weaker stature, by the more delicate antennae with consistently longer antennomeres, the 4 th one clearly longer than the previous one, by the narrower pronotum with sides more swollen behind the anterior corners, almost dentiformly protruding outwards, by the more sparsely dotted, lighter disc, by the elytra more abruptly narrowed towards the end, with a little narrower dot-stripes on the back, by the bulging-raised first interval from the end of the stripe next to the scutellum, by the 9 th one forming a shortened fold behind the shoulder, by the lower edge of the seam more gaping further back, by the simple and short basal abdominal segment in the ♂, by the metasternum, which is also not impressed, by the hind femora armed with a stronger and more blunted tooth in the same sex, by the more delicate tibiae, etc. *): Donacia abdominalis Olivier is now synonym with Plateumaris bracata and not with P. affinis Kunze.
Above all, from Don. consimilis Schrank, to which it is also closely related, it differs by the same characters as from D. abdominalis.Furthermore, it also differs in the colour of the antennae and legs from Don. rustica Kunze.
From Don.Weisei Duviv. 17) it differs above all by the shiny and not densely dotted pronotal disc, with tooth-shaped and outwards protruding front corners, by dark elytra with the first interval behind the stripe next to the scutellum, which is very bulging and raised, and the 9 th one behind the shoulder that is briefly folded up.-Nevertheless, it is easily possible that m[y] D. mongolica is just a simple aberration of the male of Donacia Weisei (which is totally unknown to me).

16
) I think that the genus Plateumaris (C.G. Thoms.)Weise, Jacobs.should be relegated to the category of a subgenus; because a number of East Asian species, above all Plateumaris excisipennis Jacobs.(Horae Soc.Ent.Ross., XXVIII, 1894, p. 241), where the author probably reluctantly failed to indicate the sex of the only original specimen in its description, seems to provide a very clear transition to the genus Donacia F. Incidentally, I suspect that Donacia excisipennis (Jacobs.)establishes its own subspecies.Prothorax much longer than wide, the disc nearly flat, the sides nearly parallel; lateral tubercles minimally convex, not very pronounced; the angles not a bit protruding, straight; the longitudinal line of the disc scarcely pronounced; the disk very finely widely punctured, irregularly, finely and densely wrinkled, hairless, silky dusky (except the shiny base).
The elytra with almost parallel lateral sides, narrowed from the last third to the rounded, truncated apex, slightly impressed twice on the back next to the suture, not strongly stripedpunctured, decorated with non-raised transverse wrinkles between the dots, shiny.
First segment of abdomen flat in the centre; anal segment apically rounded.The pygidium apically rounded.
The legs with the same colour as the body, all joints and the claws reddish-rusty brown; the hind femora completely unarmed, only bluntly angled below.
Body shinier above, the wrinkles between the grooves of the elytra lower, tooth on the hind femora smaller or extinct.
The dimensions of the body and the ratio of the lengths and widths of all parts are the same as in the typical form, but the body is much more lustrous due to the less coarse sculpture of the elytra.
The dotted grooves of the elytra are less deepened, the transverse wrinkles of the intervals, both the basal and the tiny ones, are less pronounced and smoother.The punctuation at the basis of the elytra finer and less confused.The pronotum with a sharper recess behind the lateral tubercles.
Hind femora of ♀without tooth or with a slight tubercle in its place.The upper side is bronze-copper with a greenish tint.The last four ventral sternites, antennae, and legs are reddish brown.Underside the hairs and limbs are golden or yellowish.
In the last century Plateumaris consimilis Schrank was considered as a species distributed throughout central and southern Europe and furthermore in Siberia (Jakobson, 1892) and Japan (Jacoby, 1885), since there were indications in the literature for Irkutsk (Solsky, about 1870), Ural (Redikortsev, 1908) and Japan (Jacoby, 1885) belonging to the species Plateumaris discolor Hoppe (= P. consimilis Schrank).There were no other indications, and the species was not found anywhere in localities in between either.Clavareau (1913) and Reitter (1920) give the same unmodified information as Jacobson.The gap between the distribution areas of the western and eastern form will probably be filled by a more detailed study of the fauna of the USSR, and we may have a fairly continuous distribution of the species from west to east, but this will only confirm the presence of a rather typical eastern subspecies Plateumaris consimilis orientalis.
D. pallipes: the breast somewhat quadrangular, fairly flat, slightly impressed, finely punctured, with truncated front corners, lightly sinuate on the sides; the elytra a little flattened, wrinkled, with deep points in neatly lines, rounded at the apex, the legs paler.
D. planicollis: the pronotum elongated, nearly quadrangular, rather flat, slightly impressed and punctured, narrowed posteriorly, the margin slightly convex, the sides reasonably complete, with a posterior line; the elytra arched, wrinkled, with distinct dotted stripes, rounded at the apex, the legs reddish.
Until now I have received only one specimen of rustica from Stussiner from Carniola, with femora darkened on their upper side, all others have legs which are uniformly rufous.In the vicinity of Modena (Emilia: Jala, March 1894) Mr. A. Fiori now also caught differing specimens between normally coloured specimens, from which he sent me a ♂ which is black on the upper side and shimmering bluish on the pronotum, and 2 ♀.Their legs are pitch-black, darkly rufous in the joints, or plain black.It is possible that this variety will also be found in Germany.
the prothorax almost square, narrowed towards the base, punctured finely and wrinkly, elytra at the apex roundly truncated, with dotted stripes, intervals densely and very finely wrinkled, hind femora armoured with a stout tooth.

Similar to Don[acia] thalassina Germ., but next to Plat[eumaris]
discolor Panz., to be immediately distinguished from this one and sericea L. by the elongated, much flatter body and the rather dull upper side.
antennae and legs dark reddish yellow-brown, the first antennal segment and the tip of the following segments more or less widely blackish, the upper half of the femora metallic greenish black, the apex of the tibiae and of the tarsi darkened.Antennae slender, segment 3 longer than 2, 4 longer than 3.
Bronze-green or cupreous, pronotum medium-reddish, bases of all antennal segments, as well as bases of femora and tibiae rufous, posterior margins of abdominal sternites with a yellowrufous fringe.Thorax longer than wide, slightly widened behind the protruding anterior bristle cone by a weak, poorly defined lateral tubercle, then feebly constricted, finally weakly narrowed till to the base, very finely and densely wrinkled and punctate on the disc, with a fine, obliterated median groove, which widens and deepens towards the base and turns into a transverse impression there.
Elytra wrinkled extremely densely and finely transversely, regularly punctured in rows, with two obliterated impressions on each side of the suture.
Long, slightly convex, bronze coloured above, below jet-black, silky-grey, the antennae, tibiae and tarsi dark reddish, the frons with a wide and deep groove, the prothorax square, very finely pubescent, very slightly constricted before the base, disc almost flat, shiny, rather densely punctured, the impressed middle groove deepened ahead and behind, the tubercles on both sides hardly perceptible, slightly smoothed, the elytra with dotted stripes, intervals narrow in width, the femora unarmed.Similar to Plat.rustica and affinis, to be placed next to the latter, more elongated than both, certainly different due to the deep and broad frontal furrow, whose sides form high longitudinal ridges, the shiny pronotum, whose median groove, which is shortened on both sides, is deep and sharp at the beginning and the end, flat in the middle, and next to which there is a very flat, mirror-smooth tubercle on each side, as well as the completely unarmed hind femora.
A species very closely related to Pl. consimilis Schrank, with which it has also probably been confused till now.In this work I provide a review of Plateumaris tenuicornis Balthasar, Entom. Newsletter VIII, 1934, pp. 128-129.According to the specimens on hand, there are no typal differences between Pl. consimilis and Pl.tenuicornis.That is to say Pl. consimilis varies in the following characters: In the length of the body, in the curvature of the eyes, in the shape of the temples, in the shape of the individual antennal segments, in the dotting of the head, the prothorax and the elytra and also in the shape the front angles of the pronotum, in the teeth of the hind femora and also in the colouring this species shows a very large variability.Bechyné (1942) wrote in a paragraph that Plateumaris tenuicornis Balthasar looks the same as P. consimilis.This article was ignored for decades, perhaps because it was printed in Czech and Latin.Here the part of that article that deals with P. tenuicornis in Latin is copied and translated into English.
Antennae 2 / 5 of body length, rufous, with antennomeres 3-4 nearly equal, the 3 rd one however a little shorter and more robust than the next one.Prothorax slightly longer than its greatest transversal diameter and quite fiercely narrowed posteriorly; cut squarely in front, slightly rounded and emarginate at the base, with slightly distinct angles; anterior angles followed behind by a rounded swelling, occupying 2 / 5 of the sides, clearly limited below by a fairly marked depression causing in this spot a narrowing of the pronotum; disc almost flat, covered with dots, sunken, very close and confluent, without a dorsal groove, near the base with an angular transverse groove not reaching the sides.
Scutellum punctured.Elytra elongated, distinctly narrowed behind, finely punctured-striated, with very close dots; intervals between the stripes barely raised, covered with fine transverse wrinkles.Underside coloured like above, with a rufous abdominal apex, covered with a fairly dense silvery grey pubescence.Legs rufous, hind femora slightly bulging, provided near to their end with a triangular tooth of variable size.
♀ Shape more robust, pronotum relatively wider, antennae reaching only half the length of the body.
This species is closely related to D. discolor Hoppe [= synonymous with Plateumaris consimilis Schrank]; it differs from it by its more slender, narrower shape, its smaller size, its more elongated pronotum which is more narrowed behind, with its sides not regularly rounded but slightly swollen on the first third, by the absence of a longitudinal groove on the prothorax, by its narrower elytra and the less prominent triangular tooth of the hind femora.
I dedicate this species to our colleague, Mr. Julius Weise from Berlin, to whom entomological science is indebted for serious work on Phytophages.
Latin (P.amurensis, P. bracata, P. consimilis, P. roscida, P. rustica, P. sericea), and one (P.weisei) was originally described in French.In general, most of the original descriptions of Plateumaris taxa are in Latin or began with a Latin diagnosis at least, and further explanations were then added in German, Russian, or French in most cases.
In addition to the first descriptions of the valid species in the Palaearctic, another 19 original descriptions are presented here with their translations and the species names published therein are now regarded as synonyms.Mostly, these are names which were synonymized or their synonymisation was confirmed in Geiser (2023).This list is not complete, because more than 70 names are now known to be allocated to one of the ten valid Plateumaris species.We intend to continue publishing translations of original descriptions of Donaciinae taxa.Furthermore, we encourage other colleagues to do the same in their areas of expertise.
The Latin first description of the genus Plateumaris established by Thomson (1859) and its translation are also given here.At first, Donaciinae species were assigned to the genus Leptura by Linnaeus (1758).Later, Fabricius (1775) established the genus Donacia, but did not change the genus name of Leptura sericea.Later, some authors described Plateumaris species with Donacia as the genus name, even after Thomson had established the name Plateumaris.Some authors regarded Plateumaris only as a subgenus of Donacia, and these opinions are reflected in the first descriptions.For more details see Geiser (2023).

Latin English Donacia (Plateumaris) mongolica Donacia (Plateumaris) mongolica
Prothorax plus long que large, plus étroit à la base qu'au sommet, peu convexe, canaliculé au milieu, marqué à la base d'une fossette transversale et triangulaire; dilaté sur le côtés au-dessous des angles antérieurs qui sont saillants en forme de dent obtuse et un peu rejetée en arrière; tout couvert de petites rides ou d'une sorte de réticulation très confuse et très serrée.Écusson subtriangulaire, très finement soyeux.Prothorax longer than wide, narrower at the base than at the top, not very convex, channelled in the middle, marked at the base with a transverse and triangular dimple; dilated on the sides below the anterior angles which are projecting in the form of an obtuse tooth and a bit reflected; all covered with little wrinkles or some sort of very confused, very tight reticulation.Subtriangular dorsal disk, very finely silky.Legs of the same colour, short thick, very swollen thighs, the posterior ones provided with a strong triangular tooth.Elle se place dans la mème division que la D. sericea L. et elle a de grands rapports avec elle.Elle en diffère néanmoins par de caractères bien tranchés.Les tubercules placés derrière les angles antérieurs du prothorax sont moins saillants ; à partir de ces tubercules les côtes sont un peu arqués en dedans dans la sericea et la base finit par avoir ls même largeur que le It is placed in the same division as D. sericea L. to which it is closely related.However, it differs from it by well-defined characters.The tubercles placed behind the anterior angles of the prothorax are less protruding; from these tubercles the ridges are arched inwards in sericea, and the base ends up with the same width as the anterior part; in Lacordairii the prothorax narrows, on the contrary, imperceptibly to the base, rounding out very slightly; it is also shorter.The bridges of the elytral striae are closer together, and below all the legs are shorter and thicker, and the thighs noticeably more swollen.cupreous, elytra dark copper-coloured, gloomy, the lower margin of the suture, which is wide open at the back, is ore-black, shiny, legs, mouth and antennae are wanly clay-coloured, these are slightly browned towards the apex, the posterior margin of the abdominal segments is more or less reddish.
(Fabricius, 1792)ura & summa affinitas D. Festucae.Antennae nigrae: primo articulo rufo.Caput & thorax nigra, immaculata, nitidula.Elytra minus striata minusque depressa.Adomen rufum.Pedes rufi femoribus posticis in altero sexu simplicibus in altero dentatis.Stature and next of kin to D. Festucae *).Antennae black: first segment red.Head & chest black, spotless, shiny.Elytra less striped and less depressed.Abdomen red.Legs red, hind femora simple in one sex, dentate in the other.*)D.festucae(Fabricius,1792): 116: synonym of P. sericea Antennae dimidio corpori longitudine aequales, sed multo magis tenues quam in Pl. discolore, articulo primo crasso, ceteris subtilibus, articulo 2° sesqui breviore quam tertius, 4° hoc sesqui longiore, ceteris subaequali; articulorum 2 i -11 i basibus rufo-ferrugineis.Antennae in length equal to half the body, but much thinner than in Pl. discolor, the first segment thick, the others fine, the 2 nd segment is half as short as the third one, the 4 th one by half longer than this one, the rest almost the same; the basis of the 2 nd -11 th segment is reddish-rusty brown.ZooKeys 1177: 235-258 (2023), DOI: 10.3897/zookeys.1177.103212Elisabeth Geiser & Remigius Geiser: First descriptions of Palaearctic Plateumaris species and their translations Kolossow (1930)e categorical assertion ofKolossow (1930), P. consimilis Schrank is a purely Western European species, whose eastern boundary passes through the territory of Poland (according to the materials of his collection), while records from more eastern localities are not correct and refer to other species.At the same time, we now have collections of P. consimilis Schrank from the Chernigov and Poltava regions [both sites are in the Ukraine], so we can consider it as a species not only of Western Europe.The indication for the Ural (Redikortsy), made according to the literary sources from the middle of the last century, can only be considered as probable.The presence of P. consimilis Schrank as a separate race in the Far East seems quite natural given such a large territorial distance.Structural differences from the western form by stronger shine and less wrinkling of the elytra, the more straight-lined pronotum, and a lighter coloration of the antennae are completely analogous to the same characters in the Far Eastern subspecies of other Donacia species, like, for example, D. clavipes glabrata Solsky, D. obscura splendens Jacobs.and D. thalassina rufovariegata Jacobs.

English De variatione Plateumaris consimilis Schrank. (Col. Donaciidae.) About the variability of Plateumaris consimilis Schrank. (Col. Donaciidae.)
Kopf sehr dicht und fein punktiert, mit einer scharfen, länglichen Rinne, die Erhabenheiten an der Wurzel der Fühler nur mäßig, die Augen sehr stark vorgequollen, die Schläfen stark entwickelt, mächtig hervorragend, nach hinten deutlich konvergierend.Die Halspartie stark eingeschnürt, daher auffällig akzentiert.Fühler sehr schlank, die einzelnen Glieder zur Spitze nur mäßig verstärkt.Head punctured very densely and finely, with a sharp, elongated groove, the elevations at the base of the antennae are only moderate, the eyes are very protruding, the temples are well developed, powerfully prominent, clearly converging towards the base.The neck area is severely constricted, therefore conspicuously accentuated.Antennae very slender, the individual segments only moderately widened towards the tip.La tête plus finement chagrinée que chez D. sericea avec sillon frontal plus faible; les yeux plus globuleux et plus saillants, l'étranglement postoculaire plus fort.Les articles des antennes allongés, 3 plus long que 2, mais plus court que les suivants.The head more finely shagreened than in D. sericea with a weaker frontal groove; eyes more protruding and more prominent, with a stronger postocular constriction.The antennomeres are elongated, the 3 rd one longer than the 2 nd one, but shorter than the following ones.Elisabeth Geiser & Remigius Geiser: First descriptions of Palaearctic Plateumaris species and their translations Halsschild mit einer ziemlich deutlich angedeuteten Mittelfurche, auf der Scheibe nicht besonders dicht, aber ziemlich fein punktiert, dazwischen äußerst fein chagriniert, nur an den Seiten mit kaum wahrnehmbaren anliegenden Härchen (erst bei der Vergrößerung, 40×, Zeiß, binokulares Mikroskop) besetzt.Die Seitenbeulen ziemlich stark entwickelt, die Seiten nach hinten stärker zusammenlaufend, die Vorderwinkel spitzig vorragend.Pronotum with a fairly clearly indicated central furrow, punctured on the disc not particularly densely, but quite finely, extremely finely shagreened in between, only on the sides overgrown with barely perceptible flat small hairs (only by magnification, 40×, Zeiss, binocular microscope).The side tubercles fairly well developed, the sides tapering more towards the end, the front angles pointedly prominent.Von der sehr verwandten Art Pl. consimilis Schrank durch folgende Merkmale ziemlich schwer, aber sicher zu unterscheiden: Fühler auffallend schlanker, Augen sehr stark vorgequollen, die Schläfen nach hinten konvergierend, nicht parallel und viel mehr akzentiert, Hals sehr deutlich stärker eingeschnürt, schmäler, die Lateralbeulen des Halsschildes deutlicher, oben tiefer abgegrenzt, der Halsschild schmäler, nach hinten stärker zusammenlaufend.Außerdem sind die Vorderwinkel mehr seitlich gerichtet und spitziger.Die Flügeldecken bei der neuen Art (im Falle, daß die Skulptur vollkommen konstant ist) scheinen viel feiner und dichter skulptiert zu sein.Im ganzen subtiler gebaut und kleiner.Rather difficult to distinguish but surely from the very related species Pl. consimilis Schrank by the following characters: antennae noticeably slimmer, eyes very much bulging, temples converging backwards, not parallel and much more accentuated, neck much more constricted, narrower, the lateral bulges of the pronotum more distinct, more deeply demarcated above, the pronotum narrower, converging more towards the end.In addition, the front angles are more laterally directed and more pointed.The elytra in the new species (in case the sculpture is perfectly constant) appear to be much finer and more densely sculptured.On the whole built more subtly and smaller.