Key to males of Capreolucanus

1. Bicolor species, pronotum black to brown with two distinct cross-like orange red stripes flank midline, all femurs orange red in about apical third (Fig. 1G); mentum subtriangular (Fig. 1I)............................... C. zhuchuangi Wang, 2020

- Monochromatic species, pronotum black to brown without stripes, all femurs black (Fig. 1A, D); mentum not subtriangular (Fig. 3M–R)......................................................................................... 2

2. Head with a pair of rounded anterolateral angles; when dorsal tooth present, mandible with two dorsal teeth, smaller one subapical and larger one near dorsal base (Fig. 2C); mentum without notched at anterior margin (Fig. 3P–R); flagellum usually about 6.0 times as long as aedeagus (Fig. 5D–F)............................................ C. sicardi Didier, 1928

- Head with a pair of triangular anterolateral angles; when dorsal tooth present, mandible only with one dorsal tooth behind the apex (Fig. 2A–B); mentum with anterior margin distinct notched (Fig. 3M–O); flagellum usually about 10.0 times as long as aedeagus (Fig. 5A–C)....................................................... C. yanxui Qi & Zhou, new species

Key to females of Capreolucanus

1. Bicolor species, pronotum black to brown with two cross-like orange red stripes flank midline, all femurs orange red in about apical third (Fig. 7G); mentum subtriangular (Fig. 7I)................................... C. zhuchuangi Wang, 2020

- Monochromatic species, pronotum black to brown without stripes, all femurs black (Fig. 7A, D); mentum not subtriangular (Fig. 8M–R)......................................................................................... 2

2. Canthus less developed, dividing about 1/6 of the eye (Fig. 8C–F); mentum with rounded apex (Fig. 8O–R); outer margin of hemisternite membranous at middle, base of the outer margin thickening of sclerotization and extension backward obviously (Fig. 9N, S)......................................................................... C. sicardi Didier, 1928

- Canthus more developed, dividing about 1/4 of the eye (Fig. 8A–B); mentum subtrapezoidal (Fig. 8M–N); outer margin of hemisternite sclerotized at middle, base of the outer margin not thickening and extension obviously (Fig. 9D, I)................................................................................... C. yanxui Qi & Zhou, new species