Glycobius speciosus Classification Family Cerambycidae > Subfamily Cerambycinae > Tribe Clytini > Genus Glycobius Diagnostic Features of Larvae Larva. Distinguished from Calloides nobilis by the absence of the palpifer process; last joint of maxillary palpi shorter than second; labrum subquadrate, widest at or before middle; ampullae dull, very finely granulate. Adapted from Craighead (1923). Biology and Economic Importance The habits of this species have been adequately discussed in literature. It attacks living hard maples (Acer). The larvae during the first year mine beneath the bark, often girdling the branch and causing its death. The second year a deep burrow is made obliquely up and into the heartwood at the end of which the larva pupates. Two years are required to complete the development. Adapted from Craighead (1923). Selected References to Larvae Specimens Craighead, 1923