Trichiina

Huang, Hao & Chen, Chang-Chin, 2016, Motuotrichius yangi, a new genus and species from southeastern Tibet, China (Coleoptera: Scarabaeidae: Cetoniinae: Trichiini), Zootaxa 4205 (4), pp. 365-372 : 367

Key to the Eurasian genera of Trichiina based on male specimens (modified from Krikken 2009)

1. Mesotibiae and metatibiae straight or very slightly curved.....................................................3

- Mesotibiae and/or metatibiae strongly curved inward, or abruptly bent............................................2

2. Mesotarsomere 1 elongate-dilated, densely setose. Metatibia abruptly (“knee-like”) inflexed. Clypeal apex deeply bilobate (dorsal view).............................................................. Agnorimus Miyake & Iwase, 1991

- Mesotarsomere 1 elongate-claviform, not densely setose. Metatibia straight or slightly curved. Clypeus quadrate (dorsal view), sometimes emarginate anteromedially.................................................. Gnorimus Serville, 1828

3. Proximal protarsomeres at most slightly dilated. Mesotibial apex not extended beyond apex as a drawn-out lobe; mesotibial spurs present. Metatibial spurs elongate-acuminate...........................................................4

- Protarsomeres 1 and 2 strongly expanded outward (lobiform). Mesotibial apex extended into tapering apico-internal projection; mesotibial spurs absent. Metatibial spurs variably modified, long, and/or spoon-shaped..... Tibiotrichius Miyake, 1994

4. Apico-internal spur of protibia present, movable. Antennal lamellae not longer than those of female and without impression on proximal side of first lamella........................................................................... 5

- Apico-internal spur of protibia reduced or absent. Antennal lamellae longer than those of female, and proximal side of first lamella with distinct impression along superior edge.............. Paratrichius Janson, 1881 + Pseudagenius Heller, 1923

5. Clypeal outline (dorsal view) quadrate, apical margin distinctly reflexed.......................................... 2

- Clypeal outline (dorsal view) not quadrate, apex simply bisinuate-lobate, not raised and reflexed...................... 6

6. Elytra with symmetric color pattern, usually not uniformly metallic green, disc without conspicuous striae. Elytral interstriae flat, or, if raised at all, unequally raised. Mesometasternal protrusion absent or very slight, mesocoxae (sub)contiguous....7

- Elytron uniformly shiny metallic green, disc with five or six conspicuous striae. Elytral interstriae all evenly convex. Mesometasternal protrusion between separated mesocoxae short but distinct, visible in lateral view.. Indognorimus Krikken, 2009

7. Parameres with each branch not splitting. Protibia without distinct serration proximal to the one or two distal-external teeth. Elytral disc deplanate, with indistinct strial-interstrial pattern...................................................8

- Parameres with each branch splitting into narrow internal and broad external parts. Protibia with distinct serration proximal to two distal-external teeth. Elytral disc with six fine striae, odd intervals convex................ Indotrichius Krikken, 2009

8. Metatarsomeres without conspicuous apico-internal tuft of setae. Pygidium with erect, fine, sparse setae............... 9

- Metatarsomeres with conspicuous apico-internal tuft of setae. Pygidium with stiff, (sub)appressed, dense setae............................................................................................ Epitrichius Tagawa, 1941

9. Large species (body length usually 1.5–2.5 cm). Pygidium darkened along midline. Elytra marked by small, pale spots or dots............................................................................ Gnorimotrichius Krajcik, 2009

- Small species (body length usually less than 1.5 cm). Pygidium unmarked. Elytra with basic symmetric pattern of yelloworange markings (bands) on darker background, or unmarked..................................................10

10. Mesotibia with an internal tooth. Disc of pronotum and elytra glabrous. Base color of dorsal surface green. Basolateral corner of pronotum distinctly deflexed...................................................... Motuotrichius new genus

- Mesotibia without internal tooth. Disc of pronotum and elytra setose. Base color of dorsal surface black or brown. Basolateral corner of pronotum obtusely angular, not distinctly deflexed................................................... 11

11. Scutellum longer than wide. Slender species with abundantly setose elytra, setae long.......... Lasiotrichius Reitter, 1899

- Scutellum about as wide as long. Plump species with sparsely setose elytra, setae short, indistinct........................................................................................................ Trichius Fabricius, 1775