Abstract
During current studies of Cerambycidae at Laniel, Quebec, new information on the immature forms and biology of the common woodborer, Xylotrechus colonus (Fab.) was obtained. This species belongs to the tribe Clytini of the subfamily Cerambycinae, and was first described by Fabricius in 1775 as Callidium colonus. Packard (1890) described and figured the larva, pupa, and adult in a general way; the mature larva was described in detail by Craighead (1923). Synonomy and adult description were given by Hopping (1932).

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