Subject: Red headed beetle in SE PA?
Location: Southeastern PA
May 1, 2016 7:04 pm
Hi, we found this bug in our house in southeastern PA. After a web search, the closest I can ID is the blister beetle, but the head does not seem to be an exact match. Found today, mid-Spring. Grateful for any help identifying this bug!
We believe we have correctly identified your Longhorned Borer Beetle from the family Cerambycidae as the Tanbark Borer, Phymatodes testaceus, a species that according to BugGuide is: “native to Eurasia; widely established around the world, incl. e. US and, more recently, in the Pacific Northwest.” According to iNaturalist: “Larvae develop in and under the bark of various deciduous tree species, causing damage. Larvae pupate in the spring. The beetle’s life cycle lasts one year in central and southern parts, and two years in northern climes.” It is described on Nature Spot as being: “Length 8 to 13mm. Very variable in colour from golden brown, through reddish to a deep blue-black. A common form has the thorax reddish and the elytra deep blue.”