Key to species of Antrocephalus Kirby, 1883

1. T 1 without longitudinal carinae (Figure 66); scutellum with median fovea...................... .................................................................................... A. neogalleriae Narendran and Achterberg

– T 1 with a pair of longitudinal carinae (Figure 67); scutellum without fovea ............... 2

2. Genotemporal furrow absent (Figure 71).................................................. A. decipiens (Masi)

– Genotemporal furrow present (Figure 72).................................................................................. 3

3. Genotemporal furrow shallow (Figure 72)...................... ...................... A. ryukyuensis Habu

– Genotemporal furrow deep (Figures 73,74)............................................................................... 4

4. Longitudinal carinae extending up to half the length of T 1 (Figure 68)............................. ......................................................................................................................... A. cariniaspis (Cameron)

– Longitudinal carinae less than one-fourth the length of T 1 (Figure 67)........................ 5

5. Post-marginal vein as long as marginal vein (Figure 69)...................................................... 6

– Post-marginal vein 1.25× to 1.5× marginal vein (Figure 70)............................................... 7

6. Head with a sharp angle in front of eyes in lateral view (Figure 74).................................... .............................................................................................................................. A. fascicornis (Walker)

– Head without sharp angle in front of eyes in lateral view (Figure 73)................................. .................................................................................................................................. A. dividens (Walker)

7. Teeth on ventral margin of hind femur occupying 0.7× length of the femur (Figure 77); apex of scutellum deeply emarginate (Figure 75).............................. ...................................................................................................................... A. nasutus (Holmgren)

– Teeth on ventral margin of hind femur occupying less than 0.7× length of the femur (Figure 78); apex of scutellum weakly emarginate (Figure 76).......................................... 8

8. Hind femur red (Figure 78)................................................................ A. phaeospilus Waterston

– Hind femur black with base and apex red (Figure 79).......... A. validicornis (Holmgren)