SeasonalityAdult flight period is from July to October (Linsley 1962).
IdentificationRobust, color black to brownish, dull. Head closely and distinctly, but not coarsely, punctuated. Clypeus is large and conspicuous, gula with a beard of dense pale hairs. Femora not clavate, abdoment with sternites very finely, closely punctured and densely clothed in a fine pubescence. Antennae reaching apical 1/3 of elytra with outer segments abruptly abbreviated, last 4 segments at most as long as 2 preceding segments together; pronotum very distinctly wider than long; angulated at sides; posterior tarsi with third segment cleft to middle. Apex distinctly emarginated. Females are slightly more robust than males, antennae reaching basal ¼ of elytra; fifth abdominal sternite as long as broad, apex rounded, length 17-31mm, males, 17-29mm (Linsley 1962). Overall, A. asperatus is most defined by the sharply abbreviated last 4 antennal segments, distinct asperites on the pronotum, and angular shape of the pits on the pronotum (Linsley 1962).