Bioacoustics of Oryctini

1. Body convex dorsally in lateral view. Ventral area of metatarsomeres with a longitudinal row of bristles ......................................................................................................... 2 - Body flattened dorsally in lateral view. Ventral area of metatarsomeres bearing a brush of bristles........................................................................................ Platyphileurus Ohaus 2. Protibia tridentate ............................................................................................................................... 3 - Protibia quadridentate....................................................................................................................... 5 3. Colour black. Elytra nearly smooth, except for a deep sutural stria ............................... 4 - Colour reddish brown. Elytra with distinct rows of punctures................ Coelosis Hope 4. Mandibles bidentate............................................................................................ Megaceras Hope - Mandibles tridentate.......................................................................... Megaceropsis Dechambre 5. Male head bearing a tubercle, never with a horn. Female pronotum with an anterior tubercle or concavity, or both combined .................................................................................. 6 - Male head bearing a prominent horn. Female pronotum simple, without anterior tubercle or concavity.......................................................................................................................... 8 6. Tergite VII bearing stridulatory apparatus.......................... .......................... Strategus Kirby. - Tergite VII without stridulatory apparatus................................................................................. 7 7. Teeth small and triangular at galea. Pronotum similar in both sexes, without horn or deep concavity. Female abdomen bearing the ventrite V shorter than ventrite VI...... .............................................................................................................................. Gibboryctes Endrödi. - Teeth strong and scythe-shaped at galea. Male pronotum with an anterior horn. Pronotal concavity deep in both sexes. Female abdomen bearing the ventrite V longer than ventrite VI.................... .................... Tetragus Duarte and Grossi , gen. nov. 8. Prosternal process conspicuous, produced between coxae. Female head with 1–2 tubercles, never with a prominent horn ................................................................................... 9 - Prosternal process quite reduced, nearly obsolete, confined below coxae. Female head with a prominent horn......................................... ......................................... Enema Hope. 9. Body elongated in overall aspect, subparallel laterally. Anterior margin of clypeus with 2 teeth separated by a wide emargination............ ............ Podischnus Burmeister. - Body broader in overall aspect, rounded laterally. Anterior margin of clypeus convergent, rounded, or with 2 teeth separated by a small notch............................................. ................................................................................................................ Heterogomphus Burmeister.