my son found this beetle buried in sand at a shallow depth, under a eucalypt
Adult male. There were four adult males bouncing off of the porch light. I regret that I don't have a better photo. Several specimens were captured and taken to Dr. Dante Fenoglio at the San Antonio zoo. He would be able to confirm species ID.
Large individual stayed conspicuous for 2 days in pocket prairie
Chauliognathus marginatus hiding in milkweed. Military Road Meadow. Rock Creek Park, Washingtion, DC, USA.