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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
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
27 spp. in our area(1), >180 total(2)
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)
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