Cyrtoxipha columbiana (Columbian Trig) ♀.
Size: approx. 15 mm. Photo: 06/28/14, 5 pm.

In our area there is seemingly only one species in this genus. I couldn't find any additional information on this Columbian Trig (Cyrtoxipha columbiana) with the exception of the UF sound recordings. The small photo shows a male. 

bug guide:
UF (with sound files):