Identification, Images, & Information
For Insects, Spiders & Their Kin
For the United States & Canada
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Apoid Wasps (Apoidea)- traditional Sphecidae

I keep seeing these and am not sure what they are - Chlorion aerarium bee? - Philanthus gibbosus green-faced wasp? - Saygorytes phaleratus Bee Wolf? - Philanthus gibbosus  Ammophilinae ? - Eremnophila aureonotata square-headed wasp? - Ectemnius Blue Black Wasp - Chalybion californicum Black and yellow mason wasp (2)
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 Apoid Wasps (Apoidea)- traditional Sphecidae
~1360 spp. in 112 genera of 3 families in our area(1), >9700 spp. in 4 families (Heterogynaidae is a small Old World group) worldwide(2)
Communal roosting behavior of males is very common among a number of species of Apoid wasps, as well as other groups.
Internet References