Identification, Images, & Information
For Insects, Spiders & Their Kin
For the United States & Canada

Keller, Ferry County, Washington, USA
July 1, 2010
Size: 12 mm
collected by Surber sampler from riffle in stream

Moved from Darkling Beetles.

Probably Chrysomelidae
I checked this image with Warren Steiner at the Smithsonian, and he wrote that this is not a tenebrionid, but probably a chrysomelid, and is not aquatic, but must have fallen into the stream from nearby vegetation. In fact, it looks a lot like this, including the elongate transverse black markings on the dorsum.