Corymbitodes bengalensis, Schimmel, Rainer & Tarnawski, Dariusz, 2015

Schimmel, Rainer & Tarnawski, Dariusz, 2015, Three new species of the genus Corymbitodes Buysson, 1904 from Nepal and India with a description of the male of Corymbitodes kambaitiana Fleutiaux, 1942 (Coleoptera: Elateridae), Zootaxa 3925 (4), pp. 551-561 : 552-554

Corymbitodes bengalensis sp. nov.

(Plate I: figs 1–7)

Type locality. India: N.W. Bengal, Rimbik-Shirkhola.

Type material. Holotype ♂ ( CSV): India: N.W. Bengal, Rimbik-Shirkhola, 15.–27.V.2006, 2650 m, leg. E. Kučera. Paratypes 3 ♀♀ ( CSV, CTW): same data as holotype, 1 ♀, leg. E. Kučera; Bengal, Sukiapokhiri- Jorepokhri, 30.VI.–4. VI.2003, 1 ♀, leg. E. Kučera; Nepal: Tablejung distr., Bhalukhop, 15.–21. V.2013, 1 ♀, leg. E. Kučera.

Diagnosis. C. bengalensis sp. nov. is closely related to C. nepalensis sp. nov., but can easily be distinguished by the longer antennae, sparser punctures on pronotum, plainer elytral surface, by the pronotal lateral sides almost straight and by the form of parameres which are very slightly cochleariform subapically.

Description. ♂: Silky (dorsal and ventral sides), subparallel, slightly arched, with micro-reticulated integument and eleven-segmented, serrate antennae; pronotum longitudinally campaniform; elytra subparallel; length: 9.8 mm, width: 2.3 mm; black with blackish olive-green sheen, legs brownish, femur orange red; pubescence very short, barely visible (fig. 1).

Head declined from base to apex, occiput without triangular impression; frons slightly elevated above base of antennae, apically edged; cranium with dense and umbilicate punctures, interstices of punctures reduced to small and arched wrinkles; pubescence extremely short, almost invisible and declined to apex; eyes spherical; last segment of maxilla dolabriform; mandible bi-spicate, falciform apically; antennae serrate from third antennomere on, exceeding pronotal apices by the length of the last two and a half antennomeres; second antennomere subglobular, 1.5 times longer than wide apically; third antennomere subtrapezoidal, 2.2 times longer than wide apically and slightly longer than fourth and following antennomeres; antennomeres 4–10 subtrapezoidal, apically strongly serrate and of decreasing apical width, all of them more than 1.8 times longer than wide apically (fig. 5); last antennomere oblong-elliptic, subapically very slightly constricted; pubescence short and bristly, especially long at apical edges.

Pronotum longitudinally campaniform, almost straight laterally, along median line distinctly longer than wide across posterior angles (length: 3.0 mm, width: 2.3 mm), slightly arched medially and declined to base; pronotum with shallow oval median groove from base to apex, lateral edges slightly arched; posterior angles divergent with a distinct apically cuspidate carina (fig. 3), apex obtuse (arrow, fig 3); pronotal lateral edges completely visible in dorsal view; pronotal punctures medially and laterally umbilicate with interstices equal to one or half puncture diameter (fig. 2), pronotal surface micro-reticulated; pubescence bent from median line to apex and to lateral sides.

Pro-, meso- and metathorax finely punctate, with interstices plain and shiny; pubescence conspicuously long and accumbent.

Sides of mesosternal fossa gradually concave to body axis, declivous throughout length.

Prosternal apophysis straight, subparallel to body axis, with some transverse wrinkles; apex smoothly steplike, apically obtuse.

Sternites finely punctate and covered with bristly and accumbent hairs.

Scutellum lingulate, basally straight, apically arcuate, surface distinctly arched; punctures dense and fine, interstices reduced to small and arched wrinkles; pubescence dense, fine, directed from base to apex and to lateral sides.

PLATE I. FIGURES 1–7. C. bengalensis sp. nov. 1—habitus, 2—pronotal punctures, 3—pronotal posterior angle, 4—elytral structure, 5—antennomeres 1–6, 6—elytral apex, 7—aedeagus.

Elytra subparallel, becoming very slightly narrower subapically, elytral apex arcuately bent (fig. 6), apically with a short thorn on each elytron (arrow, fig 6); base very slightly shorter than pronotal posterior angles, slightly depressed at scutellum, margins arched, shoulders prominent (winged species); elytral striae with distinct deep punctures, their interstices with smaller and fine punctures, conspicuously micro-reticulated and transversely rugose (fig. 4); pubescence short, bristly, declined to apex and to lateral sides.

Alae transparent and densely covered with very small, almost invisible brownish bristles.

Legs elongate, moderately long and thin; trochanter trapezoidal, distinctly separated from femur; longitudinally oval femur with a distal groove for accommodation of tibia, with fine and short pubescence; tibiae covered with longer and protruding bristles; tarsomeres up to claws of decreasing length, ventrally with hardly visible, fine pubescence.

Mesosternal coxae proximally convex, gradually tapering to lateral sides.

Aedeagus long and elongate (fig. 7); penis subparallel, subapically distinctly constricted, slightly exceeding paramere apices; parameres apically very slightly cochleariform, laterally slightly concave (arrow, fig 7).

Female legs completely orange-red, antennae short and not reaching pronotal basal apices for the length of the last two antennomeres.

Morphology of larvae unknown.

Etymology. The name of the new species refers to the name of the type locality.

Distribution. India: Bengal; Nepal: Tablejung district.

Remarks. The species can be included in Group 1 mentioned in the discussion.