Key to the species of adult Bothynus of Colombia

1 Head without central tubercle. Protibia tridentate (Fig. 10). Elytra strongly punctate with deep punctures arranged in distinctive rows. Apex of metatibia truncate and without spinules. Length 14–20 mm. Parameres elongate, apices strongly dilated (Figs. 12–13)...................................................................... .. Bothynus herbivorus (Arrow)

- Head with central tubercle. Protibia quadridentate (Fig. 18). Elytra nearly smooth, with very small, inconspicuous punctures. Metatibial apex with irregular margin and spinules. Length> 22 mm ............................................. 2

2 Males with protarsal inner claw simple (Fig. 7). Parameres elongate, apices strongly dilated, lobe-shaped (Figs. 4–5). Females can be only identified by association with males................................... Bothynus complanus (Burmeister)

- Males with protarsal inner claw with median tooth (Fig. 23). Parameres shorter and wider, apices slightly dilated (Figs. 20–21). Females can be only identified by association with males.......................... Bothynus quadridens (Taschenberg)