Identification key to males of Scydmaenus (Choleropsis)

1 Antennomere 5 as long as broad (Fig. 57); antennomere 9 with deep step-wise concavities on both outer and mesal margin (Fig. 57)...................................................................... Scydmaenus kroombitanus sp. n.

- Antennomere 5 strongly elongate (e.g., Fig. 51); antennomere 9 curved or bent (Figs 51, 56), with shallow lateral impression (Figs 53, 54), or with one deep lateral concavity (Fig. 55)..................................................... 2

2 Antennomere 9 bent at nearly right angle (Fig. 51).................................. Scydmaenus beechmonti Franz

- Antennomere 9 slightly curved or with lateral concavity (Figs 53–56)........................................... 3

3 Antennomere 10 strongly elongate and nearly twice as long as antennomere 9, with lateral impression (Fig. 53).................................................................................... Scydmaenus geniculatus (King)

- Antennomere 10 at most slightly elongate and only slightly longer than antennomere 9 (Figs 54–56)................... 4

4 Antennomere 9 with conspicuously deep and abrupt lateral concavity as deep as half width of antennomere (Fig. 55)................................................................................... Scydmaenus princeps (King)

- Antennomere 9 with shallow lateral impression (Figs 54, 56).................................................. 5

5 Antennomere 10 distinctly elongate, with lateral proximal asetose convexity with subtriangular distal margin (Fig. 56).............................................................................. Scydmaenus curviclavatus sp. n.

- Antennomere 10 indistinctly elongate, with transverse lateral impression, lacking asetose proximal convexity with subtriangular distal margin (Fig. 54)...................................................... Scydmaenus kurandae Franz