Key to females of the Lucanus boileaui group

1. Ventral surface of mesofemur and metafemur with orange stripes (Fig. 5F); spermatheca strongly hooked, the position of apex perpendicular to front the middle length of spermatheca (Fig. 7O); spermathecal duct long (Fig. 7M), about 5 times as long as spermatheca.................................................................. Lucanus boileaui Planet, 1897

– Ventral surface of mesofemur and metafemur black (Fig. 5B), without orange stripes; spermatheca weakly hooked, the position of apex perpendicular to behind the middle length of spermatheca (Fig. 7E); spermathecal duct much short (Fig. 7C), nearly as long as spermatheca................................................................................... 2

2. Canthus with anterior and posterior angles well-developed, clearly defined (Fig. 6H); spermatheca not sclerotized, less hooked (refer to p. 22 in Huang & Chen, 2017)......................................... .. Lucanus ludivinae Boucher, 1998

– Canthus with anterior and posterior angles weakly developed, not defined (Fig. 6C); most part of spermatheca not sclerotized, weakly sclerotized at apex only, more hooked (Fig. 7E)............ Lucanus jiaozishanus Qi, He, Su & Song, new species