Lithurgopsis gibbosa (female): Curved ridge under antennae; dented area under compound eye. Feeding on prickly pear (Opuntia austrina).
I would appreciate assistance in identifying the bee which is pollinating the Prickly Pear cactus flower shown here. It did a good job of burrowing down to get at the lower anthers. I saw a couple different individuals a couple of acres a part in the Seacrest Scrub.