SeasonalityLate June through early August.
IdentificationBeetles of B. maculativentris are dark with a bronzed lustre. on the elytra, a slight depression exists 1/4 to 1/2 the distance from the apex. Slight transverse wrinkle marks, occur in the depression. No yellow markings are present on the elytra. The last 4 abdominal sterna are usually maculated with orange spots. This species is easily confused with B. lyrata but may be distinguished by its smaller average size. Immaculate beetles of B. nutalli are very similar, but have lateral maculations on all abdominal sterna. Beetles of B. maculativentris from 13 to 20 mm.