Purpuricenus humeralis Classification Family Cerambycidae > Subfamily Cerambycinae > Tribe Trachyderini > Genus Purpuricenus Diagnostic Features of Larvae Larva. Distinguished from axillaris by the broadly oval and darker spiracles, the smallest being larger than the ocellus; the presternal plates are nearly contiguous, and the ampullae are more finely granulate. Adapted from Craighead (1923). Biology and Economic Importance Biology unknown for members of this tribe. Species of this tribe are potentially invasive outside their native range. Selected References to Larvae Specimens Craighead, 1923