Tetropium abietis Classification Family Cerambycidae > Subfamily Spondylidinae > Tribe Asemini > Genus Tetropium Diagnostic Features of Larvae Larva. Distinguished from Tetropium velutinum by the almost total absence of genal bristles and the shining glabrous spot on the center of the labrum. The form is slightly more robust. Pupa: Easily recognized by the absence of papillae on the pronotum and the coarse, very chitinous ones of the dorsal abdominal segments. This species is of economic importance, killing species of Abies at high elevations throughout the Pacific Coast region. Its habits are similar to those of T. velutinum, and it is probably often confounded with that species. It rarely pupates in the sapwood, but usually in the inner bark. Adapted from Craighead (1923). Biology and Economic Importance Biology and economic importance for this taxon coming soon. Selected References to Larvae Specimens Craighead, 1923