Longhorned Borer Beetle from Canada: Sarosesthes fulminans

Subject: thought it would be easy
Location: coldwater ontario canada
February 1, 2016 6:35 pm
Hi we have these in our house occasionally, we think they are coming in on our firewood. The wood is ash and oak. The house is only a year old and was built in the winter
Signature: Keith Prentice

Longhorned Borer Beetle:  Sarosesthes fulminans
Longhorned Borer Beetle: Sarosesthes fulminans

Dear Keith,
We turned to our copy of Arthur V. Evans excellent book “Beetles of Eastern North America” as it is easier to scan than many online sources.  We believe we have correctly identified your Longhorned Borer Beetle in the family Cerambycidae as
Sarosesthes fulminans which is described as having:  “a distinctive eyespot on the pronotum and angulate bands on elytra.  Larvae tunnel under bark and in sapwood of hardwoods, especially chestnut (Castanea), oak (Quercus), and walnut (Juglans).  Adults are attracted to light and bait traps in late spring and summer.  Quebec and Ontario to North Carolina, west to Minnesota, Iowa, and Kansas.”  This image from BugGuide looks very much like your individual.  You are most likely correct that your indoor, winter sighting is related to oak firewood.

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