Callidium antennatum Classification Family Cerambycidae > Subfamily Cerambycinae > Tribe Callidiini > Genus Callidium Diagnostic Features of Larvae Larva. Form robust, somewhat depressed ; integument rather thick, more or less reticulated, shining, covered with long castaneous hairs. Head rectangular, nearly as wide in front as behind; mouth-frame very heavily cornified, reddish brown to piceous, often much wrinkled; epistoma straight; labrum rather thick, transversely semicircular; mandibles longer than basal width, basal piece dark brown, two-thirds width of distal, latter shining, piceous; second antennal joint longest, first and last subequal, supplementary, minute, indistinct; ocellus large, yellow, widely enveloped by very large tuberculate genal shoulder. Ventral mouth-parts somewhat coriaceous, process of palpifer as long as last maxillary joint, joints of maxillary palpi successively shorter, last labial joint longer than last maxillary; anterior edge of hypostoma bearing four black, prominent, conical projections; subfossal spine distinct; gular sutures widely diverging behind. Prothorax short, rectangular, pronotum one and one-half times as wide as long, anteriorly hairy, posteriorly sparsely irregularly striate to alutaceously reticulated, no median suture; sternum reticulated, shining, not differentiated into areas; sternellar fold rather strongly fused at extremities into epipleurum. Legs four-jointed, without tarsus about as long as maxillary palpi. Abdomen: Dorsal ampullae alutaceous, shining, bounded by two lateral converging folds which are joined anteriorly by a transverse one, ventral with two deep lateral impressions; pleural discs visible on first, second, third, fourth, fifth and sixth segments. Spiracles oval, large, peritreme castaneous, thin, but distinct. Pupa: Form similar to that of adult, armed with very small, blunt, chitinous points, a few on posterior edge of pronotum, two small groups on mesonotum and metanotum, and on each abdominal tergum, growing fewer posteriorly. In some forms from Colorado these points are scarcely chitinized. Adapted from Craighead (1923). Biology and Economic Importance This species spends the greater part of the larval period boring between the bark and wood. The latter is deeply scarred, but not entered until before pupation, when a long pupal cell is constructed parallel to the grain of the wood. The frass loosely fills the burrows and much is expelled. The pupal cell is opened to the exterior by the larvae. One generation occurs each year. This insect often becomes of economic importance in rustic work. Adapted from Craighead (1923). Selected References to Larvae Specimens Craighead, 1923