SeasonalityAdults fly in spring and early summer (Johnson 2000) and have been collected in Alberta in May.
IdentificationLength greater than 6.5 mm. Body form oval, convex, blackish-piceous (Casey 1912) with fine ash-coloured pubescence (Downie et al. 1996). This species is closely related to B. americanus and has similar elytral markings except outer black vitta (longitudinal stripe) represented by 2 or 3 small indiscernible spots (El-Moursy 1970 and LeConte 1854). Labrum triangular (El-Moursy 1970) and the last joint of the palpi oval and less truncate than B. americanus (LeConte 1854). Antennomeres 1 and 11 darker (Downie et al. 1996). Pronotum and elytra sparsely and finely microreticulate (Johnson 1991). Pronotal punctures small and well separated by spaces greater than own diameter; punctures on frons large and shallow while punctures on elytra are deep (Johnson 1991). Male genitalia with median lobe bluntly pointed at apex and parameres with apices rounded (El-Moursy 1970). Female genitalia presently unidentifiable (Hatch 1961). Larvae with large hypognathous head (head and mouth directed ventrally) with distinctive ventral epicranial ridges and 6 stemmata. Similar in body form to larvae of Chrysomelidae but with noticeable lacinia and articulated galea (LeConte 1854).