Subject: Mystery bug
Location: Southern California – Murrieta
August 7, 2016 11:31 am
Please help me identify this bug. It seems to be tunneling out through the dry wall of my brand new house. It makes a perfectly round hole
Signature: Marilyn

Horntail:  Sirex nigricornis

Horntail: Sirex nigricornis

Dear Marilyn,
This is a Horntail, a type of Wood Wasp, in the family Siricidae, and we believe we have correctly identified it on BugGuide as a female
Sirex nigricornis.  According to BugGuide it has a range “across Canada (QC-AB-?BC) and the US south to FL-TX” and the larval food is “wide host range, mostly on various pines.”  Pine is a common building material, and our supposition is that there were larvae in pine logs that were used in the construction of your home, and when metamorphosis was complete, this individual emerged.  If that is the case, you may see more.

Location: Murrieta, California

Leave a Reply

Your email address will not be published. Required fields are marked *