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Genus Ectemnius

Which bee (or wasp) is this, please? - Ectemnius dives - male Square headed wasp - Ectemnius - female Ectemnius? - Ectemnius continuus Square-headed Wasp - Ectemnius continuus - male Ectemnius continuus? - Ectemnius continuus Ectemnius maculosus? - Ectemnius maculosus Crabronid -- small Ectemnius? - Ectemnius Ectemnius lapidarius - male - female
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 Crabroninae (Square-headed Wasps)
Tribe Crabronini
Subtribe Crabronina
Genus Ectemnius
Explanation of Names
Ectemnius Dahlbom 1845
Numbers
27 spp. in our area(1), >180 total(2)
Identification
Distinguishing Ectemnius from similar genera (Crabro, Crossecerus, and Lestica)(3):
Recurrent vein ending in distal third of submarginal cell
Ocelli forming a low triangle
Lacking orbital foveae (sharp groove along inner eye margin)
Upper frons evenly punctate
key to spp. in (3)
Range
Widespread in the US.
Life Cycle
most nest in dead/rotten wood (logs, stumps) or hollow stems and stock the nests with adult flies (Grissel 2007)
Internet References