This is almost certainly Pepsis grossa. This species usually has the tips of the antennae orange, and the wings are usually dark with a strong white margin on the tips.

The other species in Texas with orange on the antennae is Pepsis mildei, but it has orange wings. The P. mildei in my area have only the tip of the antennae orange as opposed to the entire antennae.

As far as I know grossa and mildei both have significant orange in the wings and not a black and silver pattern unless there is a western form of the male that is without orange. Again, you are far from my territory and this is a difficult genus. I will check the giant paper on Pepsis more thoroughly this evening.

In P. grossa it is actually the opposite, throughout most of its range it has dark wings. The pale winged form occurs more commonly in the southwestern US, but the dark form does range into the southern states as well.

Useful info. Looked in Vardy's giant article and indeed the CA and AZ populations are virtually all dark winged. Just south of Brownsville TX and in that area are more dark-winged mappings. The only forms that wander into OK AR LA are the paler or orange-winged forms. He mentions that the males generally have the last antenna tip orange. Females he states often have the apices of segment's 3 onward orange. He also states that having 12 segments in the antenna for grossa males is unique to the genus.

Well, that explains why I have found so few xanthochromatic grossa specimens! We have this dark-winged form in Tucson, but the antennae are completely black. Never seen one with orange tips like this. Very cool.

Thanks very much for the species.