Pyrrhidium sanguineum Classification Family Cerambycidae > Subfamily Cerambycinae > Tribe Callidiini > Genus Pyrrhidium Diagnostic Features of Larvae Mature larva. Very similar to that of Phymatodes testaceus, from which it may be separated as follows.1 Head with front margin of hypostoma broadly ferruginous and distinctly longitudinally or slightly obliquely striate. Prothorax with anterior third orange-yellow, and distinctly darker than posterior part which is pale testaceous. Adapted from Duffy (1953). Biology and Economic Importance Members of this tribe are known from various host plant families and several species are considered economically important. Species of this tribe are potentially invasive outside their native range. Selected References to Larvae Specimens Duffy, 1953