Epitrichius Tagawa

Li, Chun-Lin, Yang, Ping-Shih & Wang, Kuo-Sheng Hsu Chuan-Chan, 2008, A review of the genus Epitrichius Tagawa, with an analysis of the internal sac armature of the male genitalia (Coleoptera: Scarabaeidae: Cetoniinae), Zootaxa 1895, pp. 10-24 : 13-14

Key to species of the genus Epitrichius Tagawa

1 Anterior margin of clypeus distinctly raised, moderately to slightly emarginated medially, bilobed tips rounded........................................................................................................................................................2

1’ Anterior margin of clypeus not raised, distinctly emarginated medially, bilobed tips protruding................4

2 Dorsum usually overall shiny metallic green in males, metallic green or cupreous in females, females rarely blackish brown without metallic luster; basolateral angles of pronotum protruding basally; pygidium with a pair of median tufts of setae in both sexes. Taiwan............................. Epitrichius elegans ( Kano, 1931)

2’ Head and pronotum dull green, cupreous or black; basolateral angles of pronotum rounded, retracted; pygidium lacking a pair of median tufts of setae, setiferous overall with a small glabrous area centrally in males............................................................................................................................................................3

3 Head, pronotum (partly with copper red in females) and scutellum overall dull green with dense, short setae and distinct rugosity of surface, lacking lateral setose spot on sides of pronotum; major hook of internal sac always with lateral denticle ( Fig. 18 ). Taiwan......................... Epitrichius cupreipes ( Bourgoin, 1915)

3’ Overall green in males and dark in females, males collected from northern Indochina and southernmost China usually with elytra black or dull green; head and pronotum with or without velutinous surface; head glabrous, central disc of pronotum sparsely setiferous or nearly glabrous with distinctly marginal setae, setose spot on sides of pronotum present; lateral denticle of major hook of internal sac absent or vestigial ( Fig. 17 ). Eastern and southern China, northern Vietnam, northeastern Laos............................................... ...................................................................................................... Epitrichius bowringii ( Thomson, 1857)

4 Pronotum distinctly setiferous; mesometasternal process not visible when viewed laterally.........................5

4’ Pronotum glabrous or marginally setose; mesometasternal process visible when viewed laterally..............6

5 Head, pronotum and scutellum with iridescent luster; basolateral angle of pronotum distinctly produced; elytron with triple transverse markings; pygidium transversally setiferous with paired tufts vaguely defined in both sexes. Amami-Oshima Island, southwestern Japan. Epitrichius lagopus ( Fairmaire, 1897)

5’ Head, pronotum, scutellum and legs with copper red or green metallic luster; basolateral angle of pronotum weakly produced; elytron with double transverse markings; pygidium with paramedian paired tufts consisted of well defined long setae in both sexes. Northern Vietnam.... Epitrichius versutus ( Krikken, 1972)

6 Elytra reddish brown with transverse markings diffused marginally and weakly defined; internal side of metatarsomeres 1–2 densely covered with long, yellowish brown, setae ..................................................... ............................................................................................. Epitrichius shinshuingensis Li & Yang , n. sp.

6’ Elytra black with transverse markings not diffused marginally and well defined; internal side of metatarsomeres 1–2 sparsely covered with short, whitish yellow setae....... Epitrichius fraterculus ( Moser, 1902)

Figures

FIGURES 17 – 18. Major hooks of the internal sac. 17. Epitrichius bowringii; 18. Epitrichius cupreipes. Scale bar = 0.5 mm. Abbreviations: DD = dorsal denticle; LD = lateral denticle.