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Genus Anthidiellum - Rotund Resin Bees

Anthidiellum notatum - female Anthidiellum? - Anthidiellum perplexum bee? - Anthidiellum perplexum Great Bee, face - Anthidiellum notatum - male Megachilidae Anthidiellum notatum notatum?  - Anthidiellum notatum Anthidiellum ID request - Anthidiellum perplexum Anthidiellum perplexum - Perplexing Rotund-Resin Bee - Anthidiellum perplexum black & red bee?  - Anthidiellum perplexum - 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 (Anthophila (Apoidea) - Bees)
Family Megachilidae (Leafcutter, Mason, and Resin Bees, and allies)
Subfamily Megachilinae (Leafcutter, Resin, Mortar, Sharptail, Mason, and Woolcarder bees and relatives)
Tribe Anthidiini (Woolcarder, yellow-marked resin, pebble, and dark bees)
Genus Anthidiellum (Rotund Resin Bees)
Explanation of Names
Anthidiellum Cockerell
4 spp. in our area (all in the subg. Loyolanthidium), 60 spp. in 7 subgenera worldwide(1)
In this genus, the subanntennal suture

is clearly bowed toward the eyes. In other Athidini this suture is straight. (2)

The colored “line” at the base of the head
angles to form a strong, shelflike appearance. It can sometimes cover a portion of the start of the thorax. (2)

The scutellum

appears swollen and overhangs the propodeum (2)
NA and much of the Old World (warmer parts); across the US; A. notatum is the only sp. to reach Canada(1)
The cells are attached to rocks or to vegetation.
Internet References
U. Florida - Key to tribe Anthidini