Cystocnemis Motschulsky, 1860

Mikhailov, Yuri E. & Gus’Kova, Elena V., 2013, Review of the genus Cystocnemis (Coleoptera: Chrysomelidae: Chrysomelinae) with descriptions of two new species, Zootaxa 3736 (5), pp. 536-548 : 537-538

Genus Cystocnemis Motschulsky, 1860

Cystocnemis Motschulsky, 1860: 179 (type species: Chrysomela discoidea Gebler, 1830 , by original designation).

Cystocnemis: Jacobson 1895: 294 -296 (redescription); Jacobson 1926: 233-235 (catalogue); Lopatin 1977: 170-171 (redescription, key to species); Lopatin & Kulenova 1986: 120 (diagnosis, key to species); Lopatin 2010: 246-247 (redescription, key to species); Warchałowski 2010: 541-542 (key to species); Kippenberg 2010: 428 (catalogue).

Oreomela subgen. Entomomela Jacobson, 1926: 267 (type species: Oreomela (Entomomela) oirata Jacobson, 1926 , by monotypy). Transferred to Cystocnemis by Mikhailov 2013: 308.

Cystocnemis subgen. Cystocnemis s. str.: Mikhailov 2013: 311.

Cystocnemis subgen. Entomomela: Mikhailov 2013: 311 (key to subgenera and species).

Description (modified following Jacobson 1895 and Lopatin 2010).

Body oblong-ovate, more or less convex. Body length of males 4.3–7.1 mm, females 5.1–7.7 mm. Colour of pronotum either uniformly rufous or black or bicoloured: black with rufous edging of various width and shape; elytra usually black with rufous edging or rufous with elongate black spot on disc.

Head subprognathous, frons slightly depressed, delineated from clypeus by thin impression. Eyes elongate. Mandibles short, strongly curved, with sharp tooth on apex. Antenna filiform, slightly widened towards apex, antennomere 2 shortest, antennomeres 7–11 hairy.

Pronotum transverse, without lateral calli, anterior and lateral edges marginate. Basal edge of pronotum slightly arcuately protruding backwards (subgenus Cystocnemis s. str.) or slightly arcuately excised (subgenus Entomomela ). Scutellum wide triangular, acute apically, impunctate.

Elytra ovate, fused along suture, at base not wider than pronotum. Punctation confused, distinctly dual: primary punctures larger and deeper than secondary. Intervals slightly convex, shiny, covered with fine wrinkles. Epipleura gradually tapering, disappearing before apex. Humeral calli absent. Hindwings reduced.

Anterior coxal cavities closed posteriorly. Prosternal process narrow proximally and strongly widening distally. Mesosternum short, prosternum not shorter than metasternum.

Legs thick, tibiae strongly widened towards flattened apices; outer apical angles of middle and hind tibiae roundly truncated, without spur. Claws simple.

Median lobe of aedeagus in dorsal view parallel-sided with trapeziform, sharpened or rounded apex, flagellum very small. Spermatheca U-shaped or falciform. Ovipositor flat, sclerotized.

PLATE 1 (FIGURES 1A–F). Representatives of Entomoscelini genera related to Cystocnemis . a, Xenomela kraatzi Weise, 1884 , female, Kyrgyzstan, Jelal-Abad region, Toskool-Ata; b, Entomoscelis adonidis (Pallas, 1771) , male, Russia, Magadan region, near Ola; c, Potaninia assamensis (Baly, 1879) , male, China, Yunnan, Gaoligong Shan; d, Oreomela tuvensis Mikhailov, 2007 , male, paratype, Russia, SE Tuva, upper Ulin-Khan river; e, Oreomela dudkorum Mikhailov, 2007 , female, paratype, Russia, Altai Mts., Terektinsky Range; f, Suinzona potanini (Lopatin, 2002) , female (paratype of Oreomela potanini ), China, Sichuan, W of Lijipin.

Sexually dimorphic with females larger and broader than males, outline slightly divergent posteriorly: in most species, fore and middle tarsi are dilated in males and narrow in females. In males, ventral pubescence reduced only on hind tarsi, females have bare line on all tarsomeres. Posterior margin of last abdominal ventrite in males Wshaped with oblong depression in middle, last ventrite of females slightly truncated, convex. Male pygidium with truncated or excised apex and only narrow edge of metapygidium visible beneath it; female pygidium rounded or slightly subtriangular.