Arnaudius

Grossi, Paschoal Coelho & Bartolozzi, Luca, 2011, Description Of A New Genus And Species Of Stag Beetle (Coleoptera: Lucanidae: Lucaninae) From The Peruvian Andes, The Coleopterists Bulletin 65 (4), pp. 387-392 : 388

KEY TO THE SPECIES OF ARNAUDIUS

1. Canthi with anterior margin straight or weakly rounded; lateral margin of pronotum not constricted anteriorly; pronotum weakly constricted in males, straight in females......... A. digennaroi (Arnaud, Noguchi, and Bomans)

1′. Canthi with anterior margin concave; lateral margin of pronotum in males strongly constricted anteriorly; pronotum in females with a weak constriction ....................................... 2

2. Lateral expansion of ocular canthus narrower than eye length, rounded; male pronotum not projected anteriorly; punctures of elytral striae separated by at least one puncture diameter ... A. koikei (Arnaud, Noguchi, and Bomans)

2′. Lateral expansion of ocular canthus as wide as eye length, subrectangular; male pronotum projected anteriorly over the head; punctures of elytral striae separated by less than one puncture diameter.... A. bomansi new species