A rather skittish beetle found feeding on this flower. Size estimated. Comparing other images in the guide, this appears to be a Bothrotes species, a first in the guide for Texas. There are apparently only two North American species, and B. canaliculatus is listed from Texas in, say Beetles of Florida, but I don't have any ideas on the species. The eye notched by a ridge of the head above the antennal insertion can be seen here, apparently characteristic for this genus, shown by White, fig. 106 (1).

This photograph was taken during a field trip as part of the 2006 Texas Butterfly Festival in Mission, Texas. (Photo taken at the Rancho La Lomitas preserve. Many thanks to the Trevinos for their hospitality.)