#412 - Tiphiid Flower Wasp
Ignore that Mutillid label - they're related, and the females in Mutillidae and in the Thynnine and Diammine subfamilies of the Tiphiids are both wingless, but the tightly curled antennae, stout burrowing legs, and constricted abdomen, are all found in the Diamminae and the Thynninae. Or Thynnidae, since some sources have split the the later off into their own family.
If this is Diamma bicolor, the 'Blue Ant' then it's a parasitoid of mole crickets. Other Thynnines are parasitoids of beetles. In life it would have had a bright metallic blue or green body, and red legs. Collected in the 1990s, so it may well have faded a bit.
'Blue Ants', like the wingless Mutillid 'Velvet Ants', have a notoriously painful sting, that can cause anaphylatic shock.
