Megasoma sleeperi Hardy, 1972 male, dorsal view	Megasoma sleeperi Hardy, 1972 female, dorsal view

male, lateral view

female, lateral view Photos by Matthew R. Moore

Distribution: United States (southern California).

Diagnosis: Both sexes with elytra and pronotum glabrous. Males without anteriorly direct mid-prothoracic horn. Cephalic horn at base on dorsal surface without tooth or process. Pygidium on disc uniformly setose. Body color reddish-brown. Anterior angles of pronotum (horns) with apices rounded. Females with pronotum punctate. Frontoclypeal suture with tubercle on flat surface. Ocular canthus subquadrate with length medially subequal to length distally. Ocular canthus with anterior margin weakly oblique (10º angle from perpendicular).

Biological Data: Unknown.

Temporal Distribution: The few specimens examined exhibited a date range from September-October.

Larvae: Van Dam (2006) described the third-instar larvae.

References:
Hardy, A.R. 1972. A brief revision of the North and Central American species of Megasoma (Coleoptera: Scarabaeidae). Canadian Entomologist 104: 765-777.

Van Dam, M., A. Van Dam, and M.D. Wilcox. 2006. Description of the third-instar larva and adult male of Megasoma sleeperi Hardy (Scarabaeidae: Dynastinae). Coleopterists Bulletin 60: 59-67.