Submitter has sample
This beetle looks exactly like a Broad-necked Root Borer, except, the color is a dark brown, vs. black. This beetle is 1.75 inches in length. It has the long antenna that the male in this species would have.
Lisa DeBruyckere
Sept. 17, 2008, 9:11 a.m.
"It is most likely the California Prionus (Prionus californicus). It looks very much like the Broad Necked Root Borer and is common thought the Western US."
More info can be found at
http://www.bentler.us/eastern-washington/animals/insects/beetles/california-prionus-beetle.aspx
Thank you again for your report!
Lisa DeBruyckere
Sept. 18, 2008, 1:38 a.m.