Subject: Beetle ID
Location: Vancouver BC Canada
April 5, 2017 7:48 pm
Friend has a chore of planks of found wood that she is going to use as a bar top. She has heard gnoshing /scratching inside the plank. There are 3 holes in the plank. After 2 months the beetle pictured crawled out.
Do you know if the wood was local and do you know the type of wood? This is a Longhorned Borer Beetle or Longicorn in the family Cerambycidae. We are quite certain it is in the tribe Clytini, and there are several similar looking genera on BugGuide, but our top choice for your species is the Spruce Zebra Beetle, Xylotrechus undulatus. The species is described on BugGuide as being “adult body length about 12 mm” and “Adult: black to dark brown or gray with white or pale yellow markings on elytra; antennae slightly shorter than elytra; anterior of pronotum with incomplete white or yellow collar (broken in dorsal midline); two pale transverse bands divide each elytron into three approximately equal portions, with the basal portion having a pale central patch; elytra may have whitish or pale gray shading, and posterior lateral corner of pronotum may be pale yellow.” BugGuide also notes: “larvae feed under the bark of spruce (Picea spp.) and other conifers” so if the wood was pine or spruce or some other coniferous tree, that would lend credibility to the species identification. Other possibilities include Xylotrechus longitarsis which is “probably synonymous with X. undulatus” according to BugGuide and the Banded Ash Borer, Neoclytus caprea, which according to BugGuide is found as far north as Idaho, meaning the wood might not have been local. Additionally, BugGuide notes the species feeds on hardwoods including “sapwood of ash, sometimes oak, hickory” and that “often emerges indoors from firewood; sawlogs may become infested within 20 days of felling during summer.” Our money is still on the Spruce Zebra Beetle.
Thankyou, I think you have got it. The wood is Spruce.