Of medium size, oblong-oval, subconvex; nest to last segment of labial palpi plurisetose and longer than the last; prosternum with several setigerous punctures at tip; protibia with outer angle not prologed; protarsi of male with dense, spongy pubescence beneath; first metatarsal segment not as long as three following together.

Antennae and tarsi reddish brown; lateral pronotal margins distinctly depressed...................a. harrisii

Antennae and tarsi black; lateral pronotal margins feebly depressed...............................b. nigerrimus