The species of the genus Hypodynerus de Saussure (Hymenoptera, Vespidae, Eumeninae) occurring in Brazil

Abstract An identification table and descriptions are given to recognize the two species of Hypodynerus (Hymenoptera: Vespidae: Eumeninae) recorded from Brazil: Hypodynerus arechavaletae (Brèthes) and Hypodynerus duckei (Bertoni) comb. n. The lectotype is designated and the male is described for Hypodynerus duckei, its presence being recorded from Brazil for the first time.


Introduction
Hypodynerus is a fairly large South American genus of potter wasps with nearly 50 presently recognized species (Barrera Medina 2011). Its species are distributed from Colombia to Southern Chile (Willink 1970), mostly along the Andes and westward, and with a decreasing number of species in the biogeographical provinces of Patagonia, Monte, Pampas, Chaco and the Parana subregion. Just two species are recorded from the latter area, which are the only two species found up to now in Brazil.
The species of Hypodynerus are recognizable by having the tergum 1 without a transverse carina but with a well-marked preapical longitudinal sulcus, the male sternum 7 with a marked medial longitudinal channel, the anterior pronotal face devoid of coarse macropunctation or medial foveae, but with two shallow and widely separated transverse submedial impressions and the propodeum without upper lamellae, without a separate dorsal horizontal surface and with a well-developed medial carina not preceded by a fovea; propodeal valvulae rather small, gently rounded and completely fused to the submarginal carina. They also share the following characters: Maxillary palpi 6-segmented; labial palpi 4-segmented; female without cephalic foveae; pronotum without oblique humeral carina and well developed pretegular carina; epicnemial carina undeveloped; regularly spindle-shaped tegula with the hind apex pointed and emarginated, embracing the parategula; prestigma short; second submarginal cell basally acute and anteriorly sessile; axilla simple and posteriorly falling perpendicularly into the axillary fossa; scutellar crest not lamellate over the axillary fossa; axillary fossa wide open; metanotum simple and metsomal terga and sterna with simple apical margin (Carpenter and Marques 2001, Carpenter and Garcete-Barrett 2003, Sarmiento and Carpenter 2006. Willink (1970) separated seven species groups (humeralis, ruficollis, excipiendus, arechavaletae, labiatus, caupolicanus and chiliotus) and revised the first of the groups. In two subsequent papers (Willink 1978a and1978b) he revised the following two groups, but up to now the remaining four groups, representing the bulk of the genus, are still unrevised, although some scattered new species, belonging to those groups, have been described since then (Willink 1981, Willink and Lobo 1992, Pérez 1999, Barrera Medina 2011.

Material and methods
This paper is mostly based on material deposited in the entomological collection of the Departamento de Zoologia, Universidade Federal do Paraná (DZUP) and some additional material including the types of Nortonia duckei Bertoni from the invertebrates collection of the Museo Nacional de Historia Natural del Paraguay (IBNPY), as well as some additional specimens kindly loaned to us by Jucélia Iantas from the Universidade Estadual do Centro-Oeste, UNICENTRO.
A few abbreviations have been used in the descriptions: F, T and S accompanied by a number refer to antennal flagellomeres and metasomal terga and sterna respectively.

The Brazilian species of Hypodynerus de Saussure
The Brazilian Hypodynerus belong in the arechavaletae group, which was characterized by Willink (1970) as having a rather campanulate, relatively narrow and dorsally evenly convex, not-angulate T1, and S2 basally convex to flattened, without any kind of tubercle or angulation. They are medium sized wasps with rather simple propodeum, male antennae and male mid-legs, and with a general body shape resembling some species of Pachymenes or Pachyminixi. This species group is the most important one representing the genus to the east of the Andes and its species are, in general, less hairy than in most of the other species groups. The genitalia of both species found in Brazil is peculiar in bearing a pecten of coarse setae on the basivolsella, above a field of sparser setae, and by having a mostly bare digitus, with some thin setae just along the ventral margin. The species are separable by the characters given in Table 1.
1) Pronotum gently rounded longitudinally along the humeral region, without a well-marked humeral angle as seen in posterior oblique view. 2) T1 shorter: 0.88 times as broad as long in females and with a slightly shorter petiole (ratio of pre-spiracular : post-spiracular section = 7:10), clearly campanulated in males.
2) T1 longer: 0.73 times as broad as long in females and with a slightly longer petiole (ratio of pre-spiracular : post-spiracular section = 8:10), more gradually widening behind in males. 3) Mesonotal admedial line a narrow shallow depression.
3) Mesonotal admedial line raised into a thin carina. 4) Propodeum bent along between the lateral and posterior surfaces.
4) Propodeum rather rounded-off between the lateral and posterior surfaces. 5) Propodeal concavity with at most some reflective pilosity very close to the submarginal carina as seen from above. 5) Propodeal concavity covered with reflective pilosity over most of its surface.
7) Metasoma with yellow apical bands, a narrow one on T1 and moderately broad ones on the following terga and sterna. 7) Metasoma with at most (males) a narrow yellow apical band on T1 and gradually thinner and weaker, medially fainter, bands on T2-T6 and S2-S6, being them thinner and testaceous to absent in females.
8) Mesosoma all dark in both sexes.
8) Mesosoma with lemon-yellow (males) to testaceous (females) markings including: hind pronotal margin, upper mesepisternal spot (absent in females examined), scutellar crests, lateral scutellar spots (absent in females examined) and transverse metanotal band. 9) Females with at most a large dorsal reddish area on all tibiae, and darkly reddish apex of femora. 9) Females with legs all reddish apically from the apex of femora.
Clypeus subshining, with moderate micropunctation separated by 2-4 diameters, all covered with sparse and thin macropunctures and just some coarser and denser ones at the apex. Head and mesosoma covered with moderately dense macropunctation which gets absolutely thin and sparse behind the ocelli and is much denser and partly coalescent at the very suprahumeral area. Tegula dull, densely micropunctate and with some scattered thin macropunctures along its inner margin. Metepisternal surface with just very few scattered thin macropunctures and with some short longitudinal striae anteriorly. Propodeum coarsely striatopunctate on its upper half at sides and behind, becoming thinly striate and sparsely macropunctate bellow. Disc of T1 covered with scattered macropunctures. T2-6 and S2-6 dull and with just hardly visible, very scattered microscopic macropunctures.
Whole body covered with pale golden-brown apressed pile. Head, mesosoma, T1, S1 and S2 also with long, pale yellowish-brown, erect hairs. Propodeal concavity with at most some reflective pilosity very close to the submarginal carina as seen from above.
Male: Body length 10.7 mm. Wing length 9.4 mm. Coloration and structure as described for the female but: without reddish color on the legs and with a broad yellow line along the clypeus. F11 yellowish dorsally and F8-F10 reddish ventrally. T7 mostly yellow and S7 reddish basally at middle. Clypeus shorter, more convex and more definitely notched between acute teeth. Flagellomeres not especially elongate and hardly with dorsal knobs. F8 with a deep semicircular ventro-apical notch. Sensillae of F8 and F10 small and nearly circular. Sensilla of F9 about twice as large and irregularly circular, with a more or less flat side basally. T1 not too different in shape to that of the female. Nortonia duckei Bertoni, 1918: 194, 207 as follows: an orbital spot just above the clypeus, a very brief orbital line on the upper temple, very thin hind pronotal margin, pronotal lobe (very darkly), very dark and mostly absent small subalar spot, scutellar and metanotal crests, a transverse and briefly medially interrupted metanotal band (absent in most of the specimens), a very thin marginal line on T1 (even weaker medially) and rather obscure marginal bands on T2-T5. Dark reddish are: pronotal lobe (occasionally and very dark), a very small subalar spot (in just one specimen), sides of T1 behind and below the spiracle, a reduced latero-basal marginal region of T2, almost imperceptible lateral indications of apical band on T2-T5 and all of the legs dorsally from the very apex of the femur to the last tarsomere. Wings light brown stained, darker along all of the costal region, including the marginal cell. Pterostigma amber brown and venation dark chestnut.
Clypeus elongate, about 1.25 times longer than broad, with a moderately raised and flattened disc and with the apex hardly broader than the interantennal distance and subtruncate, very shallowly emarginate between rounded lateral teeth. Temples rounded. Pronotal carina rounded off at humeri, not angled at all, as seen posterolaterally. Mesonotal admedial line raised into a thin carina. Parapsidal lines well marked. Notauli well marked along the posterior fourth. Scutellum very slightly elevated mesoanteriorly, but not tuberculate. Propodeum rather rounded-off between the lateral and posterior surfaces, sides gently convex as seen from behind. T1 elongate campanulate, with a slightly longer petiole than in H. arechavaletae (0.73 times as broad as long in females and ratio of pre-spiracular : post-spiracular section = 8:10).
Clypeus subopaque, with moderate micropunctation separated by 1-3 diameters, all covered with sparse and thin macropunctures and just some coarser and denser ones at the apex. Head and mesosoma covered with moderately dense macropunctation which gets thin and sparse behind the ocelli and are much denser and partly coalescent on the upper pronotal face and an anterolateral area of the mesoscutum. Tegula subshining, moderately micropunctate and with very few scattered thin macropunctures along its inner margin. Metepisternal surface with a number of moderately scattered macropunctures and longitudinally striate on its anterior half. Propodeum coarsely striatopunctate on its upper half behind, sparsely striatopunctate above at sides and becoming thinly striate and sparsely macropunctate bellow. Disc of T1 covered with moderately dense macropunctures. T2-6 and S2-6 dull and with just hardly visible, very scattered microscopic macropunctures.
Whole body covered with brown appressed pile. Head, mesosoma, T1, S1 and S2 also with long, pale yellowish, erect hairs. Propodeal concavity covered with reflective pilosity over most of its surface.
Male: Body length 8.4-8.7 mm. Wing length 7.9-8.0 mm. Coloration and structure as described for the female but: without reddish color on the legs, with all of the flagellum orange ventrally, with all of the yellow markings sharper and brightly lemonyellow and including: a large apical spot on the clypeus, inner orbital markings linear and reaching the opening of the ocular notch, posterior margin of pronotum, subalar spot, lateral subanterior spot on scutellum, scutellar crest, complete metanotal band, a thin and clear marginal band on T1-T4 and S2, and more obscure (and gradually more obscure posteriorly) ones on T5-T6 and S3-S6. F2-F8 strongly nodular anteriorly. Clypeus shorter, more convex and more definitely notched between acute teeth. Flagellomeres elongate and F1-F8 with a progressively stronger dorsal knob. F8 shallowly emarginated ventro-apically. Sensilla of F8 and F9 large, elyptical and about equal in size. Sensilla of F10 very small and circular. Disc of T1 more elongate than in female. Biology. Unknown.