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Genus Stigmus

Aphid Wasp - Stigmus Small Wasp - Stigmus Little Wasp ID Request - Stigmus Unknown Hymenoptera - Stigmus Unidentified cavity dwelling bee - Stigmus small black wasp with big square head - Stigmus Tiny wasp - Stigmus Tiny wasp - Stigmus
Classification
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)
No Taxon (Apoidea sans Anthophila – Apoid Wasps)
Family Crabronidae (Square-headed Wasps, Sand Wasps, and Allies)
Subfamily Pemphredoninae
Tribe Pemphredonini
Subtribe Stigmina
Genus Stigmus
Numbers
8 spp. in our area(1), 24 spp. total(2)
Identification
Similar to Spilomena, but metasoma distinctly petiolate.

Key to species in: Krombein, K. V. (1973). Notes on North American Stigmus Panzer (Hymenoptera, Sphecoidea). Proceedings of the Biological Society of Washington. Full Text Here