Tragidion armatum Classification Family Cerambycidae > Subfamily Cerambycinae > Tribe Trachyderini > Genus Tragidion Diagnostic Features of Larvae Larva. Form elongate, subcylindrical, robust; integument firm, yellowish tinged, shining, densely covered with long, fine, light castaneous hairs. Head as in Knulliana, except that the outer face of the mandible has a sulcus; labrum widest behind, hairs sparser; ocellus smaller, more projecting, beadlike; anterior edge of hypostoma arcuate, somewhat protruding, first joint of antennae shortest. Prothorax quadrate; lateral ochraceous plates wanting, presternal oval, separated about their width; sternum entirely hairy, no eusternal glabrous spot; posterior area of pronotum smooth and shining except for a slight irregular tendency of hind margin to be striate; ampullae strongly tuberculate; spiracles narrowly oval, peritreme thin. Adapted from Craighead (1923). Biology and Economic Importance The larva makes extensive mines in the dry stems of Yucca. Adapted from Craighead (1923). Selected References to Larvae Specimens Craighead, 1923