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Genus Chlorion

Wasp ID? - Chlorion aerarium Blue Mud Dauber Wasp - Chlorion aerarium Sphecid? - Chlorion aerarium - female Chlorion aerarium - female Steel-blue Cricket Hunter? - Chlorion aerarium - male Sphecid - Chlorion blue wasp - Chlorion - female 4- winged blue mud dauber - Chlorion aerarium
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)
Family Sphecidae (Thread-waisted Wasps)
Subfamily Chloriontinae
Genus Chlorion
2 spp. in our area(1) and 20 spp. worldwide(2)
the only member of the genus that dig their own nests, Chlorion aerarium is most common in loose gravelly or sandy soil, and is not as attached to human habitations as the two common mud daubers C. californicum and Scelifron caementarium.
Differs from the superficially similar Chalybion as follows:
Tarsal rake (females only)
Head and thorax sparsely hairy
Propodeum with U-shaped dorsal enclosure defined at least posteriorly by a semicircular sulcus/furrow (Chalybion has at most a median sulcus or pit)
generally larger
the head is more produced at the temples and vertex (different head shape)

...Note greenish or purplish color of many Chlorion vs. blue in Chalybion. The shape of the pronotoum is more strongly notched in Chalybion; ...the head of Chlorion is broader.
C. aerarium preys on crickets, C. cyaneum on cockroaches