Ancognatha, Erichson, 1847

Figueroa, Luis & Ratcliffe, Brett C., 2016, A New Species Of Ancognatha Erichson (Coleoptera: Scarabaeidae: Dynastinae: Cyclocephalini) From Peru, With Distributions Of Peruvian Ancognatha Species, The Coleopterists Bulletin 70 (1), pp. 65-72 : 71

KEY TO THE SPECIES OF ANCOGNATHA IN PERU

1. Dorsal surface black or piceous; pronotum occasionally reddish brown or testaceous...2

1′. Dorsal surface primarily testaceous, with secondary black or piceous markings...............4

2. Frons with 2 small tubercles, lacking broad swelling ............. A. scarabaeoides Erichson

2′. Frons lacking distinct tubercles, instead with low, transverse swelling...............................3

3. Swelling on frons prominent, flattened in front (occasionally emarginate). Pronotum strongly convex, disc with small, sparse punctures...... ...................................... A. castanea Erichson

3′. Swelling on frons small, not prominent, not flattened in front. Pronotum normally convex, disc nearly smooth, with micropunctures only ............................ A. erythrodera (Blanchard)

4. Frons with low, transverse tubercle mesad of each eye.................... A. corcuerai Figueroa and Ratcliffe , new species

4′. Frons lacking tubercles................................5

5. Mentum deeply incised at apex, incision longer than base...........................................6

5′. Mentum at apex with short incision............7

6. Male pygidium densely punctate with long setae. Female epipleuron strongly thickened into elongate knob. Parameres with subapical tooth.............. A. vulgaris Arrow

6′. Male pygidium sparsely punctate, with short setae. Female epipleuron simple, not enlarged. Parameres with apices broadly rounded ......... ............................ A. humeralis (Burmeister)

7. Pygidium glabrous ......................................... .............................. A. ustulata (Burmeister)

7′. Pygidium distinctly setose ............................. .......................................... A. lutea Erichson