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Genus Crabro - Shield-handed Square-headed Wasps

Crabro - female Wasp ID [Crossocerus? nitidiventris??] ID Request - Crabro Unknown Wasp - Crabro latipes - male Philanthus of some type?  - Crabro - male Ectemnius? - Crabro Mustache Wasp - Crabro wasp with fly - Crabro - female Crabro latipes?  - Crabro - male
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 (Apoid Wasps (Apoidea)- traditional Sphecidae)
Family Crabronidae
Subfamily Crabroninae (Square-headed Wasps)
Tribe Crabronini
Subtribe Crabronina
Genus Crabro (Shield-handed Square-headed Wasps)
Explanation of Names
Crabro Fabricius, 1775
Numbers
46 spp. in our area(1), ~90 total(2)
Identification
Distinguishing Crabro from similar genera (Crossecerus, Ectemnius, and Lestica)(3):
Recurrent vein ending before distal third of submarginal cell
Ocelli forming a low triangle
Lacking orbital foveae (sharp groove along inner eye margin)
Males front tibiae distinctly expanded
Range
widely dist. thru North & Central. Amer. (DL data)
Season
mostly: May-Sept (BG data)
Remarks
"The male's front tibiae are greatly expanded into shields [this is true for most species, except for those in the Crabro hilaris species group. Comment by Matthias Buck]. He covers the female's eyes with those things during mating. The plates don't blind her, but apparently filter light in such a way that she recognizes this is a male of her own species." Comment by Eric Eaton.
Internet References