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Species Pachodynerus nasidens - Keyhole Wasp

Striking little wasp - Pachodynerus nasidens Wasp striped end of abdomen - Pachodynerus nasidens small black wasp with yellow tip - Pachodynerus nasidens Wasp - Pachodynerus nasidens - female Pachodynerous nasidens?  - Pachodynerus nasidens Pachodynerous nasidens?  - Pachodynerus nasidens Keyhole Wasp? - Pachodynerus nasidens dark Wasp with yellow abdominal bands  - Pachodynerus nasidens
Kingdom Animalia (Animals)
Phylum Arthropoda (Arthropods)
Subphylum Hexapoda (Hexapods)
Class Insecta (Insects)
Order Hymenoptera (Ants, Bees, Wasps and Sawflies)
No Taxon (Aculeata - Ants, Bees and Stinging Wasps)
Superfamily Vespoidea (Yellowjackets and Hornets, Paper Wasps; Potter, Mason and Pollen Wasps and allies)
Family Vespidae (Yellowjackets and Hornets, Paper Wasps; Potter, Mason and Pollen Wasps)
Subfamily Eumeninae (Potter and Mason Wasps)
Genus Pachodynerus
Species nasidens (Keyhole Wasp)
Explanation of Names
Pachodynerus nasidens (Latreille 1812)
8-12 mm(1)
Not readily distinguishable from P. pulverulentus, with which it co-occurs in TX & AZ
so US (AZ, TX, FL) to South America; introduced in S. Pacific islands(2)
See Also

Brachygastra mellifica has a much smaller first gastral segment
Works Cited
1.American Insects: A Handbook of the Insects of America North of Mexico
Ross H. Arnett. 2000. CRC Press.
2.The genus Pachodynerus in North America (Hymenoptera: Vespidae: Eumeninae)
Carpenter J.M. 1986. Proc. Ent. Soc. Wash. 88: 572-577.