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 : 539-540

Key to the species and subspecies of Cystocnemis Motschulsky, 1860

1 Disc of pronotum convex, basal margin of pronotum slightly arcuately protruding backwards. Subgenus Cystocnemis Motschulsky, 1890 ..................................................................................... 2

– Disc of pronotum flattened, basal margin of pronotum slightly arcuately excised. Subgenus Entomomela Jacobson, 1926 ... 8

2(1) Pronotum, ventral side and legs uniformly rufous. Male foretarsi narrow......................................... 3

– Pronotum bicoloured: black with rufous edging of various width and shape. Male foretarsi dilated..................... 6

3(2) Elytral punctation appears homogeneous, as primary ones are only slightly larger than secondary. Elytra uniformly rufous, rarely with blurry dark spot on disc (Fig. 2a). Apex of aedeagus widely rounded, slightly narrowed before apex ( Fig. 5 ). [Saur- Tarbagatai mountains, Dzhungarian Alatau]....................... Cystocnemis (Cystocnemis) concolor (Kraatz, 1879)

– Elytral punctation visibly heterogeneous as primary ones larger and deeper than secondary. Elytra either black with narrow or wide rufous edging, or rufous with elongate black spot having clear-cut edges. Apex of aedeagus trapezoidal or somewhat triangular; if triangular, median lobe visibly narrowed before apex................................................ 4

4(3) Apex of aedeagus trapezoidal, faintly separated from the rest of median lobe ( Fig. 6 ). Mountains of the Border Dzhungaria [Kazakhstan-China border]........................... Cystocnemis (Cystocnemis) discoidea gebleri (Jacobson, 1897)

– Aedeagus visibly narrowed before its rounded-triangular apex. Southern or Mongolian Altai......................... 5

5(4) Body length of males 6.7–7.1 mm. Elytra rufous with elongate black spot on disc (Figs 2c–d). Aedeagus broad with sharpened apex ( Fig. 7 ). Southern Altai (Kurchumsky and Asutau mountain ranges)... Cystocnemis (Cystocnemis) zintshenkoi sp. nov.

– Body length of males 5.2–6.2 mm. Elytra black with narrow rufous edging (Figs 2e–h). Aedeagus narrow with rounded apex ( Fig. 8 ). South-West of Mongolian Altai (Arshantyn-Nuruu mountain range).................................................................................................... Cystocnemis (Cystocnemis) levmedvedevi sp. nov.

6(2) Body length of males 6.1–6.5 mm, females 7.4–7.7 mm, male foretarsi slightly dilated, legs black (Fig. 3a). Eastern Kazakhstan (Kalbinsky mountain range).................. Cystocnemis (Cystocnemis) discoidea jacobsoniana Mikhailov, 2013

– Body length of males 4.3–5.2 mm, females 5.1–6.0 mm, male foretarsi strongly dilated, legs bicoloured or rufous(Figs 3b-c)..................................................................................................... 7

7(6) Body broader, legs bicoloured (Fig. 3b). Piedmontane form. Western piedmonts of Altai, isolated localities in Central Kazakhstan................................................................................................................................................... Cystocnemis (Cystocnemis) discoidea discoidea (Gebler, 1830)

– Body elongate, legs uniformly rufous (Figs 3c-d). Alpine form. Western, Central and Southern Altai........................................................................ Cystocnemis (Cystocnemis) discoidea oreas Mikhailov, 2013

8(1) Upperside uniformly black (Figs 3e–f). South-Eastern Altai and North of Mongolian Altai........................................................................... Cystocnemis (Entomomela) oirata (Jacobson, 1926) - Typical form

– Head and pronotum (at least at sides) brick red, elytra black (entirely or except for lateral margins).................... 9

9(8) Pronotum black with brick red sides (Fig. 3i). Aedeagus with almost straight sides and straight truncated apex ( Fig. 10 ). South of Mongolian Altai (system of Munkh-Khairhny-Nuruu mountains)... Cystocnemis (Entomomela) arnoldii (Lopatin, 1974)

– Pronotum entirely brick red (Figs. 3g –h). Aedeagus with rounded apex and sides ( Fig. 9 )........................................................... Cystocnemis (Entomomela) oirata— colour morph from North-West of Mongolian Altai

Figures

FIGURES 5 – 10. Aedeagi of Cystocnemis spp. in dorsal and lateral view. 5, С. concolor (Saur Mountain Range, Karaungir river valley); 6, C. discoidea discoidea (Eastern Kazakhstan, Ul’binsk); 7, C. zintshenkoi sp. nov., holotype (Eastern Kazakhstan, Bukombai Mts.); 8, C. levmedvedevi sp. nov., holotype (W Mongolia, Hovd aimag, Arshantyn- Nuruu Mts.); 9, С. (Entomomela) oirata, lectotype (Mongolian Altai, Sagsai river valley); 10, С. (Entomomela) arnoldii, holotype (Mongolian Altai, Munkh-Khairkhan Mts.). Scale bar— 1.0 mm. (5, 6, 9, 10 — from Mikhailov 2013; 7, 8 — orig.).