Arhopalus productus Classification Family Cerambycidae > Subfamily Spondylidinae > Tribe Asemini > Genus Arhopalus Diagnostic Features of Larvae Larva. In general as described for Asemum striatum, but readily distinguished by the much coarser asperities of the pronotum and the numerous interspaced glabrous spots. Mandibles robust, dorsal plate of cutting edge strongly striate; genal bristles more dense. Caudal spines acutely conical and slightly incurved (curved toward each other). Form more robust and densely pubescent. Pupa: Resembles that of Asemum nitidum except that the prothorax is sparsely and regularly covered with fine whitish pubescence. Adapted from Craighead (1923). Biology and Economic Importance This species, occurring throughout the Rocky Mountains and the Pacific Coast regions attacks dying and dead species of Pinus, Abies, and Pseudotsuga. It is strictly more primary in its attack than Asemum, being often found mining under the bark of trees infested by Dendroctonus long before the leaves begin to fade. The larva is more of a heartwood feeder, probably living in this stage at least two years. The mines are tightly packed with fibrous frass. Adapted from Craighead (1923). Selected References to Larvae Specimens Craighead, 1923