Usana

Key to species of the genus Usana

1. Frons with marking(s).................................................................................. 2

- Frons without marking................................................................................. 4

2. Frons with 2 rounded dark brown markings near the apex (Fig. 39); disks of pronotum and mesonotum in dorsal view with 8 and 6 longitudinal dark brown stripes, respectively (Figs 5, 37).................................. U. concava sp. nov.

- Frons, pronotum and mesonotum not as above............................................................... 3

3. Forewing with several small transverse dark brown stripes especially in area of clavus (Figs 1–4, 28); dorsal lobe of phallobase in dorsal view with apical margin aspergilliform (Fig. 35); apex of phallic appendage with 2 small spines at inner side (Figs 35–36)......................................................................... U. aspergilliformis sp. nov.

- Forewing without transverse stripes in area of clavus (Figs 9–12, 64)?dorsal lobe of phallobase in dorsal view with apical mar- gin roundly convex, and deeply cleft from base to apical 1/ 4 in midline (Fig. 71); apex of phallic appendage without 2 small spines at inner side (Figs 71–72)............................................................ U. fissura sp. nov.

4. Vertex with 1 or 2 longitudinal brown stripes................................................................ 5

- Vertex without brown stripes............................................................................. 7

5. Discs of vertex and pronotum with 2 longitudinal stripes between lateral carinae respectively.......................... 6

- Discs of vertex and pronotum with only one longitudinal stripe between lateral carinae respectively (Figs 21, 23, 97)............................................................................................ U. unispina sp. nov.

6. Genae with a brown spot below antenna (Chen, Yang & Wilson, 1989: Fig. 9 B); tegulae without a spot (Matsumura, 1914: Fig. 7 a; Chen, Yang & Wilson, 1989: Fig. 9 A).......................................................... .. U. yanonis

- Genae without a spot below antenna (Figs 14, 16, 74); tegulae with a spot (Figs 13–16, 73).................. U. lineolalis

7. Genae with a brown spot below antenna....................................................................8

- Genae without spot below antenna........................................................................ 9

8. Pronotum and mesonotum with a broad longitudinal brown stripe behind each eye (Figs 7–8, 49); medioventral process of pyg- ofer with apical margin convex, roundly cleft to apical 1/ 4 in the midline (Fig. 56)............. U. congjiangensis sp. nov.

- Pronotum and mesonotum behind eyes without stripe (Fennah, 1978: Fig. 186); medioventral process of pygofer with apical margin truncate, angularly cleft to apical 1/ 2 in the midline (Fennah, 1978: Fig. 189)..................... U. demochares

9. Ventral lobe of pronotum with a dark brown spot (Figs 18, 20); forewing yellowish brown with a black marking at base, costal margin and clavus with a longitudinal pale yellow stripe respectively (Figs 17–20, 88)............ U. oblongincisa sp. nov.

- Ventral lobe of pronotum with without a spot; forewing pale yellowish brown without a marking at base and without a longitu- dinal stripe in clavus (Distant, 1916: Fig. 45)..................................................... U. abdominalis