Not much response to our earlier posts so we decided to go back out and see if we could get some better images. We were thinking this might be Belotus abdominalis, in the Cantharidae, based on Yanega fig. 353. Dillon & Dillon has Trypherus latipennis which also sounded like a possibility, and now that we see all the other similar images on bugguide are posted under the genus Trypherus, that's where we'll put these.