Colacus, Ohaus, 1910, Ohaus, 1910

Figueroa, Luis, Ratcliffe, Brett C. & Neita-Moreno, Jhon César, 2023, A Review of the Genus Colacus Ohaus, 1910 (Coleoptera: Scarabaeidae: Dynastinae: Agaocephalini) with Description of a New Species from Peru, The Coleopterists Bulletin 77 (1), pp. 58-62 : 60

KEY TO THE SPECIES OF ADULT COLACUS

(modified from Sobral et al. 2019)

1. Head, pronotum, and elytra black. .............. 2

1′. Head and pronotum black, elytra light reddish brown or yellowish brown................... 4

2. Cephalic tubercle emarginate. Femora ventrally dark reddish brown............................................... C. rubrofemoratus Sobral, Morais, and Grossi

2′. Cephalic tubercle entire, not emarginate. Femora ventrally black................................ 3

3. Protibia tridentate. Pronotum with shallow, subapical fovea................... C. morio Ohaus

3′. Protibia quadridentate. Pronotum evenly convex, lacking shallow, subapical fovea ........... .......... C. cuchimilco Figueroa and Ratcliffe, new species

4. Clypeal apex acute. Labium slightly convex in lateral view, apex with 2 small projections ( Neita-Moreno 2015: fig. 10a) ...................... ............................................ C. bicolor Ohaus

4′. Clypeal apex nearly truncate. Labium strongly convex in lateral view, apex lacking 2 small projections ( Neita-Moreno 2015: fig. 29a) .............................. C. moroni Neita-Moreno