Tetropium velutinum Classification Family Cerambycidae > Subfamily Spondylidinae > Tribe Asemini > Genus Tetropium Diagnostic Features of Larvae Larva. Form more robust than Tetropium cinnamopterum: (epistoma more abruptly declivous; labrum entirely covered with hairs. Pronotum and ampullae more darkly though less densely velvety. Caudal spines minute chitinous tubercles separated little more than their length. Pupa: From the specimens studied this pupa cannot be distinguished from that of T. cinnamopterum. This insect is of considerable economic importance, causing the death of Tsuga heterophylla and Larix throughout the Rocky Mountains and the Pacific Coast region. It has also been found in Pseudotsuga and Pinus. The larvae mine between the bark and wood, entering their pupal cells constructed in the outer sapwood or bark late in the summer. Adapted from Craighead (1923). Biology and Economic Importance Biology and economic importance for this taxon coming soon. Selected References to Larvae Specimens Craighead, 1923