A review of the genus Berosus Leach of Cuba (Coleoptera, Hydrophilidae)

Abstract The Cuban fauna of the genus Berosus Leach, 1817 is reviewed based on newly collected material as well as historical and type specimens. Nine species are recognized, including three recorded from Cuba for the first time: Berosus infuscatus LeConte, 1855, Berosus interstitialis Knisch, 1924 (= Berosus stribalus Orchymont, 1946 syn. n.) and Berosus metalliceps Sharp, 1882. Only one of the nine Cuban species, Berosus chevrolati, remains endemic to Cuba, as two other species previously considered as endemic to Cuba are recorded from elsewhere: Berosus quadridens from Mexico and Central America and Berosus trilobus from the Dominican Republic. Notes on biology and Cuban distribution are provided for all nine species. Berosus quadridens Chevrolat, 1863, stat. restit. is removed from synonym with Berosus truncatipennis and considered a valid species.


Palabras clave
Hydrophilinae, Berosini, taxonomía, nuevo sinónimo, nuevo registro, Caribe, región Neotropica, clave de identificación introduction The hydrophilid genus Berosus Leach, 1817 is the largest genus in family Hydrophilidae, containing more than 270 species distributed worldwide (Hansen 1999, Short andFikáček 2011) and inhabiting various types of standing and slowly running waters (Oliva and Short 2012). The genus has been little studied in the Caribbean and in Cuba specifically, and the current knowledge is based primarily on occasional collecting events and historical records. Chevrolat (1863) described three species which are until now considered Cuban endemics: Berosus trilobus Chevrolat, 1863, B. quadridens Chevrolat, 1863and B. aculeatus Chevrolat, 1863 (the name of the latter was later changed to B. chevrolati Zaitzev, 1908 due to the homonymy). Gundlach (1891) provided short redescriptions of these species and few additional records. Another supposedly endemic species, B. stribalus Orchymont, 1946, was described later by Orchymont (1946. Spangler (1973Spangler ( , 1981 recorded B. undatus (Fabricius, 1792) for the first time from Cuba and provided additional records on the five Cuban species. Hansen (1999) only listed four species of Berosus from Cuba. Finally, Peck (2005) published the most complete checklist of Cuban Coleoptera with data on their distribution; in this work he listed seven species of Berosus. Except of the published works, an unpublished thesis by Van Tassell (1966) contains additional data on Cuban Berosus, which we also adopt here.
In this paper we provide a review of the Cuban fauna of Berosus containing redescriptions of the three of four species described as Cuban endemics (B. chevrolati, B. quadridens and B. trilobus), we synonymize the fourth supposedly endemic species B. stribalus with a widely distributed Caribbean B. interstitialis, provide identification key and illustrations of all Cuban species and notes on their distribution and bionomics based on newly collected material. Three species are newly recorded for the Cuban fauna.

Materials and methods
This study is mainly based on the material collected during the field survey of Cuban aquatic beetles conducted between 2008 to 2012 by A. Deler-Hernández, Y. S. Megna and F. Cala-Riquelme. The survey was mainly focused on eastern Cuba, but several areas of western Cuba were also sampled. In total, the samples from 170 localities have been collected, of which only 40 sites yielded Berosus. Specimens were collected with aquatic nets and preserved in 70%-95% ethanol. Except of this material, we also used the following sources of information: i) recently collected specimens provided to us by some Cuban colleagues; ii) material deposited in the zoological collection of the Instituto de Ecología y Sistemática in La Habana, Museo de Historia Natural "Charles T. Ramsden", Universidad de Oriente in Santiago de Cuba, National Museum in Prague and the Division of Entomology of the University of Kansas in Lawrence; and iii) literature records (Chevrolat 1863;Gundlach 1891;Van Tassell 1966;Spangler 1973Spangler , 1981Hansen 1999;Peck 2005). In the systematic section we provide detailed descriptions and differential diagnoses for three species originally described as Cuban endemics (B. chevrolati, B. quadridens and B. trilobus), for remaining species we only include a short diagnosis summarizing the most important diagnostic characters.
Habitus photographs were taken using Canon D-550 digital camera with attached Canon MP-E65mm f/2.8 1-5× macro lens, and subsequently adapted in Adobe Photo shop CS2. Photographs of genitalia were taken using Nikon Coolpix P6000 digital camera attached to Olympus BX41 compound microscope and subsequently combined with Helicon Focus software. Line drawings were traced from the photographs taken using a Canon PowerShot A620 camera attached to a Zeiss Stemi 2000-C stereomicroscope or with the same equipment as for taking the habitus photographs. Dissections of male genitalia and mounting techniques follow those used by Oliva and Short (2012). Complete label data are provided for type specimens, data of additional material are listed in an adapted form; our notes to the label data are in square brackets [ ]; and it is added the catalogue number for each vial of the Cuban material deposited in BSC-E. General morphological terminology follows Hansen (1991) and Komarek (2004), special terminology concerning Berosus follows Oliva (1989) and Oliva and Short (2012).

Berosus chevrolati
Diagnosis. Small, widely elongate species, body length 3.6-4.6 mm. Head dark, metallic; pronotum pale, with median unpaired narrow black longitudinal spot mesally, pronotal punctation not darkened; elytra pale with irregular small dark spots in posterior half of elytral intervals. Elytral apices each without subapical tooth. Mesoventral process highly laminar, square-shaped, with large anterior and posterior teeth. Abdominal ventrite 1 with median keel throughout its length. Emargination of abdominal ventrite 5 rectangular with a median teeth. Median lobe of the aedeagus with short basal projection and rounded apex in lateral view. Differential diagnosis. Berosus chevrolati resembles B. trilobus (with which it may even co-occur) by the small strongly punctate body, metallic head, presence of an unpaired dark spot on the pronotum, mesoventrite with hooded anterior tooth, median keel developed throughout abdominal ventrite 1, emargination of abdominal ventrite 5 rectangular with single median tooth and the median lobe of the aedeagus with long basal lobe projecting far posteriad and enlarged apical portion in lateral view. It differs from B. trilobus by the narrow central dark spot on the pronotum (dark spot is large and trilobate in B. trilobus), elytra more evenly convex (subapical area of each elytra forms a bump in B. trilobus), short basal projection of the median lobe (long in B. trilobus) and, rounded apex of the median lobe in lateral view (apex is beak-shaped in lateral view in B. trilobus).

Redescription.
Habitus as in Figs 1a, b. Body length 3.4-4.6 mm. Body short and wide, moderately convex. Head black with metallic sheen, labrum black. Antennae testaceous. Maxillary palpi testaceous with palpomere 4 brown at apex. Pronotum testaceous with a central elongate metallic spot. Scutellum black with metallic sheen. Elytra testaceous with small brown spots without discrete borders. Pro-, meso-and metafemora testaceous, basal portion of metafemora sometimes slightly darker. Head with moderately large and rounded punctures. Pronotum with punctures of the same size as on head. Scutellum with a few deeply impressed punctures slightly smaller than those on the pronotum. Elytral striae well-impressed. Interstriae with small and shallow punctures, irregular long setae on posterior half of elytra; spine-like setae absent. Elytral apices entire and rounded, of same shape in males and females. Mesoventral process highly raised, square-shaped, with hood-like anterior tooth, posterior tooth moderately large (Fig. 1c). Metaventral process wide, slightly raised, squareshaped, with large, deep glabrous rhomboid median depression; posterolateral angles raised and rounded, posteromesal projection carinate. Abdominal ventrite 1 with median carina throughout its length. Abdominal ventrite 5 with deep rectangular emargination, bearing a broad median tooth (Fig. 1g). Basal pubescence on basal 0.7 of mesoand of metafemora, the margin between pubescent and bare portions sinuate. Protarsus of male with adhesive soles on the first basal tarsomeres, first and second tarsomere distinctly thickened, third tarsomere very slightly thickened, fourth tarsomere elongate, almost as long as tarsomeres 1-3 combined. Claws moderately long, slender, arcuate.
Male genitalia (Figs 1d-f): Phallobase ca. 0.6× total length of aedeagus. Parameres in lateral view wide basally, apically projecting into rounded apex slightly bent ventrad, bearing a row of subapical setae ventrally. Median lobe C-shaped in lateral view; basal projection short, directing apicad; apex wide and rounded in lateral view.
Distribution. Currently only known from Cuba. Spangler (1981) recorded this species from several localities across the island, but all new material is from two sites in Santiago de Cuba province.
Habitat. We collected B. chevrolati along the margins of lowland streams and in isolated pools along these streams, in both cases having clear to turbid water and abundant organic matter (Fig. 11a). This species is found at low altitudes (ranging from sea level to ca. 160 m a.s.l.) situated in the Central Valley (Valle Central). Berosus chevrolati is frequently associated with B. trilobus in those habitats. Spangler (1981) also collected the species in standing waters. ( Hansen (1999).  Diagnosis. Habitus as in Figs 2a, b. Body length 3.0-3.7 mm. Head testaceuos, pronotum testaceous without median darker spots, punctation not darkened, elytra testaceous with irregularly arranged ill-defined slightly darker spots. Elytral apices entire and rounded in both sexes. Mesoventral process highly laminar, triangular in shape, anterior tooth large projecting posteriad (Fig. 2c). Abdominal ventrite 1 with median keel developed on basal half only. Emargination of abdominal ventrite 5 rectangular, without teeth ( Fig. 2g) (in non-Cuban specimens, a very small medial tooth is present: Testa and Lago 1994). Aedeagus (Figs 2d-f) with median lobe only slightly shorter than parameres, with apex curved ventrad, bearing two series of long setae on dorsal surface.

Berosus exiguus
Distribution. Eastern USA (from New York to Florida, westwards reaching to Illinois, Indiana, Mississippi and Oklahoma), Bahamas (Young 1953;Hansen 1999;Peck 2005) and Cuba. In Cuba, it is known from the central and eastern region.
Habitat. Berosus exiguus is mainly restricted to brackish waters in coastal regions. Cuban specimens have been collected in temporary brackish pools with clear water, abundant organic detritus on the bottom and associated aquatic riparian vegetation.  Hansen (1999).  Diagnosis. Habitus as in Figs 3a, b. Body length 5.5-6.0 mm. Head metallic black with paler anterior margin of clypeus; pronotum pale, with a pair of closely associated dark narrow longitudinal spots mesally, elytra brownish with indistinct irregularly arranged slightly darker spots. Head and pronotum with very distinct mesh-like microsculpture on interstices. Elytral apices entire and rounded in both sexes. Mesoventral process laminar, anterior tooth large, projecting posteriad (Fig. 3c). Abdominal ventrite 1 with median keel developed only between metacoxae. Emargination of abdominal ventrite 5 rectangular, with two sharp medial teeth (Fig. 3g). Aedeagus (Figs 3d-f) with median lobe slightly shorter than parameres, arched in lateral view. Parameres sinuate on lateral margin subapically.

Berosus infuscatus
Distribution. USA (Alabama, Arkansas, Florida, Georgia, Illinois, Indiana, Louisiana, Mississippi, Missouri, North Carolina, Texas, Wisconsin), Mexico (Young 1953;Hansen 1999) and Cuba. The above specimens represent the first record of B. infuscatus from Cuba and the West Indies.

Berosus interstitialis
Diagnosis. Habitus as in Figs 4a, b. Body length 5.0-5.3 mm. Head uniformly dark, metallic green; pronotum pale with a pair of closely aggregated longitudinal nar-row dark spots mesally; elytra pale with darkened punctation and with dark spots in anterior and posterior third of intervals 1 and 2, in humeral area and at midlength of intervals 7-9, plus with variable number of spots on remaining intervals. Elytral apices entire in both sexes. Mesoventral process laminar, with small anterior tooth projecting ventrad, nearly straight middle portion and rounded posterior part (Fig. 4c). Abdominal ventrite 1 with median keel developed only between metacoxae. Emargination of ventrite 5 deep, subrectangular, with two slender medial teeth (Fig. 4g), not showing sexual dimorphism. Aedeagus (Figs 4d-f) strongly compressed from sides; parameres ca. 2× as long as phallobase, wide throughout in lateral view except for tooth-like apex; bases of the parameres in dorsal view with characteristic basal teeth.
Taxonomic note. The synonymy of Berosus stribalus with B. interstitialis was first proposed in an unpublished thesis by Van Tassell (1966: 302). The reasons for the synonymy were not explained, and Cuba (i.e. type locality of B. stribalus) was not even mentioned in the distribution of B. interstitialis in the taxonomic part of the thesis. We were not able to examine the types of B. tessellatus from the collection of Fleutiaux in MNHN as the specimens were not found. We therefore examined the specimens identified as B. tessellatus and B. interstitialis deposited in IRSNB, including one male from Guadeloupe (type locality of B. tessellatus) bearing the note that it was compared with the types of B. tessellatus by A. d'Orchymont. Comparison of these specimens with the types of B. stribalus and with newly collected Cuban specimens revealed that they all specimens agree in the diagnostic characters mentioned above, including the characteristic shape of the aedeagus and a characteristic tooth on the base of each paramere. We may therefore confirm the unpublished synonymy proposed by Van Tassell (1966) and consider B. stribalus as a junior subjective synonym of B. interstitialis.
Habitat. Cuban specimens were collected mainly in standing waters as well as in isolated pools along streams and rivers in the lowlands. The localities are usually exposed to sun and have turbid water, muddy bottom, submerged vegetation and are rich in organic matter.
Distribution. USA (California), Mexico, Bahamas (Young 1953;Hansen 1999) and Cuba. The above specimen represents the first record of B. metalliceps from Cuba.
Habitat. The Cuban specimen was collected in the highly exposed brackish permanent lagoon with muddy bottom.  Published Cuban records: Cuba: without specified locality (Smetana 1988). Pinar del Río: without specified locality (Peck 2005).
Diagnosis. Habitus as in Figs 6a, b. Body length 4.1-5.2 mm. Head metallic black, pronotum pale with two small submedian dark spots anteriorly, elytra pale with rather sharply defined dark spots on intervals 1-2 and in humeral area. Elytral apices entire and rounded. Mesoventral process laminar, triangular in shape, anterior tooth large, projecting posteriad (Fig. 6c). Abdominal ventrite 1 with median keel developed only between metacoxae. Emargination of abdominal ventrite 5 rectangular with a single median broad and short tooth (Fig. 6g). Aedeagus (Figs 6d-f) with median lobe slender, pointed at apex, parameres shorter than median lobe, very wide in lateral view, narrowing into sharply pointed apex bearing tuft of setae apically. Phallobase long, ca. 0.6× total length of aedeagus.

Berosus quadridens
Diagnosis. Large elongate species, body length 6.2-6.7 mm. Head testaceous with darker central part of clypeus and frons; pronotum pale, with a pair of vaguely defined narrow black longitudinal spots mesally, pronotal punctation darkened; elytra pale with dark elytral striae, interval punctation and variable number of larger dark spots on elytral intervals. Elytral apices each with a large subapical tooth, sutural angle sexually dimorphic, rounded in males, sharply pointed in females. Mesoventral process highly laminar, subtriangular in shape, anterior tooth weakly developed. Abdominal ventrite 1 with median keel developed only between metacoxae. Emargination of abdominal ventrite 5 deeply and narrowly excised in males, shallowly semicircular in females. Aedeagus large, with joint parameres pointed apically, with subbasal tuft of setae on dorsal surface, ventral membranous lobes minute, median lobe slender and long.
Differential diagnosis. Berosus quadridens is easily distinguishable from B. truncatipennis by the relatively larger and more sclerotized aedeagus having stouter and relatively longer phallobase, by ventral face of parameres bearing subbasal tuft of setae ( Fig. 8g) (whereas bearing a series of setae (Fig. 8c) in B. truncatipennis), by relatively longer and narrower median lobe and minute membranous dorsal projections of the parameres (Figs 8e, f, h) (in contrast to moderately large ones present (Figs 8a, b, d) in B. truncatipennis). The aedeagus of B. quadridens may resemble that of B. megaphallus by its large size and presence of subbasal tuft of setae on ventral face of the paramere, but both species distinctly differ by the size and proportions of the phallobase (ca. half as long as the whole aedeagus and very robust in B. megaphallus; ca. third as long as the whole aedeadus and less robust in B. quadridens) and by the proportions of the ventral membranous lobe of the paramere (minute in B. quadridens, nearly as long as paramere in B. megaphallus). In general, the aedeagus of B. quadridens looks like an enlarged aedeagus of B. truncatipennis on the first view, whereas that of B. megaphallus clearly differs from both B. truncatipennis and B. quadridens by the general proportions of its parts. We failed to find any realiable external differences between B. truncatipennis and B. quadridens; Van Tassell (1966) indicates the differences in the shape of the apical portion of elytra -these were found rather constant in shape in examined specimens of B. quadridens, but seem to be very variable in examined specimens of B. truncatipennis  Both aedeagi shown to scale. and the character seems to be therefore unrealiable for distinguishing both species at the moment. Based on the differences mentioned above, we confirm that B. quadridens is a valid species, distinct from B. truncatipennis.
Head and pronotum with punctures moderately fine and rounded. Elytral striae narrow well impressed. Interstriae fine and flat, bearing spine-like setae on posterior half of elytra. Scutellum with few impressed punctures. Elytral apices bidentate, each bearing a projection on sutural angle and subapically; shape sexually dimorphic, with sutural angle rounded in males (Fig. 7d), sharply pointed in females (Figs 7c). Mesoventral process highly laminar, triangular in shape, anterior tooth barely visible, followed by a convex and smooth ridge (Fig. 7e). Metaventral process raised, triangular in shape, with elongate and deep glabrous median depression; posterolateral angles produced into triangular laminae, posterior projection pointed. Abdominal ventrite 1 with median carina only between metacoxae and with large, deep, rounded lateral depressions. Abdominal ventrite 5 with a deep rounded emargination without tooth in males (Fig. 7g), in females with semicircular apical notch (Fig.  7f). Basal pubescence of meso-and metafemora covering basal two thirds of femoral length, borderline between pubescent and glabrous portion sinuate on mesofemur, straight on metafemur. Protarsus of male with adhesive soles on the two basal tarsomeres, protarsomeres 1-2 thickened, tarsomere 1 longer than tarsomere 2, tarsomere 3 elongate; tarsomere 4 elongate, as long as tarsomeres 1-3 combined. Claws long, slender and curved.
Male genitalia (Figs 8e-h): Phallobase robust, ca. 0.4× as long as whole aedeagus, slightly widening basad in lateral view. Parameres joint mesally, together forming a dish-like structure surrounding median lobe; apical portion rounded in lateral view, pointed in ventral view; ventral portion of each paramere with minute membranous lobe; dorsal face of each paramere with a tuft of setae situated subbasally. Median lobe stick-shaped, reaching to apical 0.75 of paremeres.
Taxonomic comments. Described from Cuba, Berosus quadridens was considered endemic to the island, whereas the continental form was supposed to represent the widely distributed South American species B. truncatipennis (e.g., Zaitzev 1908, Knisch 1924. Based on two females from Cuba (one of which we reexamined in this study), Mouchamps (1963) synonymized B. quadridens with B. truncatipennis. This was questioned by Van Tassell (1966) who followed the unpublished opinion of J. Balfour-Browne and considered B. quadridens as a species separate from B. truncatipennis occurring not only in Cuba, but also in Central America. The thesis by Van Tassell (1966), and therefore the revalidation of B. quadridens, remained unpublished and was only adopted without any explanatory comments in the catalogue of Cuban beetles by Peck (2005). Hansen (1999) considered B. quadridens as a dubious synonym of B. truncatipennis pending revision (Hansen 1999). Oliva (1989) considered the size and proportions of the genitalia of B. truncatipennis as geographically variable, being larger and wider in subtropical areas. Recently, Oliva & Short (2012) described the specimens with the large aedeagus from Venezuela and Guyana as a separate species B. megaphallus Oliva & Short, 2012, but the identity of the Central American and Caribbean specimens remained unsolved.
We were not able to examine the unique type of B. quadridens from "Cuba", as it was not found in MNHN after our loan request in 2012. A single species of Cuban Berosus matching the original description by Chevrolat (1863) was found in Cuba in our survey; no closely related or similar species was recorded from Cuba. We therefore do not have doubts that the Cuban specimens examined correspond to Chevrolat's (1863) understanding of B. quadridens. Moreover, Van Tassell (1966 mentioned that J. Balfour-Browne has examined the type of B. quadridens and found it to be conspecific with Central American specimens identified previously as B. truncatipennis. This corresponds with our findings, as we found that all examined Central American specimens of "B. truncatipennis" are conspecific with the Cuban ones, and clearly differ from the South American species (see Diagnosis above for diagnostic characters).
By confirming the separate species status of B. quadridens, the originally widely understood B. truncatipennis is shown to consist of three species: the widely distributed South American B. truncatipennis, B. quadridens confined to the Caribbean and Central America, and B. megaphallus known so far from Venezuela and Guyana. In the material from IRSNB we examined for this study, we have found few specimens from Bolivia (Río Beni) and southern Peru (Ica) which male genitalia are extremely similar to those of B. quadridens by their large size, strong sclerotization and relatively longer phallobase; however, they seem to differ from B. quadridens by the presence of the series of setae on the paramere (as in B. truncatipennis) and the dorsal membranous lobe of the paramere being ca. as long as in B. megaphallus (examined only in the Bolivian specimen, indistict in dissected Peruan ones). We suppose that these specimens may represent yet another undescribed species of the formerly broadly understood B. truncatipennis.
Habitat. The Cuban specimens examined in the present work were collected in highly exposed freshwater pools with turbid water, muddy bottom and without cover vegetation. Gundlach (1891) also reports this species from permanent ponds in the Matanzas Province.

Berosus trilobus
Diagnosis. Small widely elongate species, body length 3.2-3.7 mm. Head dark, metallic; pronotum pale laterally, with large trilobite central dark spot, pronotal punctation not darkened laterally; elytra pale with dark intervals 8-10 and large transverse dark spots on posterior half of elyttral intervals 1-7. Elytral apices without subapical tooth, bumpy along suture subapically. Mesoventral process highly laminar, rectangular with large anterior and posterior teeth. Abdominal ventrite 1 with median keel throughout its length. Emargination of abdominal ventrite 5 rectangular with a median tooth. Median lobe of the aedeagus with long basal projection and beak-like apex in lateral view.
Differential diagnosis. For diagnostic characters and difference from B. chevrolati, see the latter species.
Redescription. Habitus as in Figs 9a, b. Body length 3.2-3.7 mm. Body short and wide, moderately convex in lateral view. Labrum black, dorsum of head melanic with strong metallic luster. Antennae testaceous. Maxillary palpi testaceous with palpomere 4 dark at apex. Pronotum testaceous with unpaired metallic black spot, the spot expanding laterad posteriorly, and hence trilobite in general shape. Elytra testaceous with small ill-defined dark brown spots on disc and, a broad metallic dark area throughout lateral portion. Pro-, meso-and metafemora with pubescent portion dark brown, glabrous portion testaceous.
Head with moderately large and rounded punctures. Pronotum with punctures slightly larger than on head. Scutellum with few impressed punctures. Elytral striae distinctly impressed; intervals flat and wide, irregular long setae on elytra; spine-like setae absent. Elytral apices entire and rounded in both sexes; highly bumpy along suture, depressed laterally on sides. Mesoventral process raised, rectangular in shape, with hood-like anterior tooth, posterior tooth large (Fig. 9c). Metaventral process widely rectangular, with large and deep elongate glabrous median depression; posterolateral portions bulge-like, posterior projection pointed. Abdominal ventrite 1 with median carina throughout the length. Abdominal ventrite 5 with rectangular emargination bearing broad and sharp median tooth (Fig. 9g). Meso-and metafemora with pubescence covering basal 0.7 of total length, borderline between pubescent and glabrous portion sinuate. Protarsus of male with adhesive soles on tarsomeres 1-2, tarsomeres 1-2 distinctly thickened, tarsomere 3 elongate; tarsomere 4 2× as long as tarsomere 3. Claws long, slender, slightly arched.
Distribution. Dominican Republic and Cuba. The species was until now considered as Cuban endemic (e.g., Hansen 1999, Peck 2005, although Van Tassell (1966) mentioned specimens from the Dominican Republic. We are here confirming the occurrence of the species in the Dominican Republic based on recently collected specimens deposited in KSEM.
Habitat. In our survey, the specimens of B. trilobus were collected usually in streams and rivers with stony or sandy bottom, clear water and with or without aquatic vegetation (Figs 11a, b), although once it has also been collected in a temporary pool with stony-muddy bottom, abundant organic matter, turbid water and rich submerged vegetation. Berosus trilobus is found in elevations ranging from sea level to ca. 850 m a.s.l. ( Hansen (1999). Published Cuban records: Santiago de Cuba: Laguna Juraguá (Spangler 1981); Siboney (Spangler 1981). Holguín: Gibara, La Aguada (Spangler 1981).

Berosus undatus
Diagnosis. Habitus as in Figs 10a, b. Body length 6.3-7.2 mm. Head metallic black; pronotum pale with a pair of closely arranged elongate longitudinal black spots mesally, pronotal punctuation darkened; elytra pale with darkened striae and interval punctuation, plus with larger elongate dark spots on posterior half of intervals 1-4 and at midlength of intervals 8-10. Elytral apices with subapical spine in male (Fig. 10g), entire and rounded in female (Fig. 10h). Mesoventral process lowly laminar with large tooth directed posteriad (Fig. 10c). Abdominal ventrite 1 with median keel developed only between metacoxae. Emargination of abdominal ventrite 5 rectangular, with two broad and short medial teeth (Fig. 10i). Aedeagus (Figs 10d-f) with median lobe ca. as long as parameres, lateral margins of parameres subparallel except apically; median lobe narrow in dorsal view, slightly wider in lateral view.

Key to identification of Cuban
Dark pronotal spot large and trilobate, narrow anteriorly and very wide posteriorly (Fig. 9a). Subapical area of each elytron forming a bump (Figs 9a-b). Apex of the median lobe beak-shaped in lateral view, basal projection of the median lobe long (Fig. 9e)  Dark pronotal spot narrow, situated mesally, not widened posteriad (Fig. 1a). Subapical area of each elytron without a distinct bump (Figs 1a-b). Apex of the median lobe rounded in lateral view, basal projection of the median lobe short (Fig. 1e) Pronotal disc without spots (Fig. 5a) or with small submesal anterior spots (Fig. 6a), never with a pair of mesal elongate large dark spots throughout the pronotal length. Apical emargination of abdominal ventrite 5 without tooth (Fig. 5g) or with a single medial tooth (Fig. 6g) Elytral striae distinctly darkened, elytral disc without numerous darker spots (Figs 5a-b). Apical emargination of abdominal ventrite 5 without median