Xylotrechus quadrimaculatus Classification Family Cerambycidae > Subfamily Cerambycinae > Tribe Clytini > Genus Xylotrechus Diagnostic Features of Larvae Larva. Distinguished from Xylotrechus aceris in that the ampullae are not entirely covered by pubescence, but the center is glabrous, dull granulate; dorsal ampullae without pubescence on anterior edge; first joint of antennae transverse, second about one and one-half times as long as thick; labrum slightly wider than long; abdominal spiracles more narrowly oval except first and last. Pupa: Similar to X. aceris but spines all more slender and not so heavily chitinized, the two median ones on each abdominal tergum conspicuously larger than others. Adapted from Craighead (1923). Biology and Economic Importance The larva has the peculiar habit of girdling branches of Betula and Fagus. It cuts the branch from the inside, causing it to drop early in the fall. It then constructs a long burrow up the center. The work is often common in Betula on the tops of mountains. Adapted from Craighead (1923). Selected References to Larvae Specimens Craighead, 1923