Anoplius is a very complex genus, and the species are difficult to identify even from mounted specimens. Orange markings suggest either Anoplius atrox or A. americanus, if memory serves. They can get to be very large. I hope more people photograph members of this entire family, as images are incredibly scarce. Look around aphid colonies (especially on young catalpa trees), on flowers, and on the ground for females toting spiders or seeking them out. Look on tree trunks for some small ant mimics like Dipogon, and larger species like Tachypompilus.