Subject: A few bugs
Location: Chicago, Il
July 24, 2013 2:57 pm
Hi! Can you help me figure out what these bugs are? The first picture is a little black bug I found in my bathroom. He pretended to be dead when I picked him up to put him outside. The second one I found during a walk. I live in Chicago. Both were found this month. Thanks!!!
Signature: Sarah T

Milkweed Longhorn

Milkweed Longhorn

Hi Sarah,
The beetle you found on your walk is a Milkweed Longhorn in the genus
Tetraopes.  Your other beetle is a Spider Beetle and they infest stored foods, so check out the pantry and stored pet food for a possible infestation.  Milkweed Longhorns are strongly associated with milkweed plants which provide food for both the adults and larvae.  According to BugGuide:  “Adults feed on leaves of milkweed (Asclepias); larvae feed externally on roots of host (root feeding is unique among Lamiinae). Each species (or subspecies) is associated with one or a few species of Asclepias (an example of coevolution) (Farrell & Mitter 1998).”  We believe your Milkweed Longhorn is the  Red Milkweed Beetle, Tetraopes tetrophthalmus, based on photos posted to BugGuide.  Because we want to draw more attention to habitat loss and the importance of the biodiversity associated with native milkweed plants, we have selected your submission as the Bug of the Month for August 2013, and the posting will go live to our site on August 1.

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Location: Chicago, Illinois

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