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For Insects, Spiders & Their Kin
For the United States & Canada
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Family Megachilidae - Leafcutter, Mason, and Resin Bees, and allies

bee - Megachile xylocopoides - male Dark blue, hairy bee - Osmia lignaria Bee - Osmia Little leafcutter bee? - Megachile - female Unidentified Bee (Striped Sweat Bee?) - Osmia Solitary bee - Osmia Dianthidium floridiense? - Dianthidium floridiense - male - female Bee - Atoposmia
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 (clade Anthophila) - Bees)
Family Megachilidae (Leafcutter, Mason, and Resin Bees, and allies)
Explanation of Names
Megachilidae Latreille 1802
>630 spp. in 18 genera of 4 tribes and 2 subfamilies in our area, ~4,100 spp. in ~80 genera of 11 tribes and 4 subfamilies worldwide(1)
Overview of our fauna (* –taxa not yet in the guide)
Family Megachilidae
Subfamily Megachilinae
6‒18 mm
Front wings with two submarginal cells, abdomen with pollen-collecting basket (scopa) ventrally (absent in parasitic species)(2)
Guide to eastern genera in (3)
Labrum longer than wide
worldwide and throughout NA(1)
The nest above ground in various cavities.(4)
Life Cycle
Some are leaf-cutters, nesting in ground, in cavities, wood. Tunnels are bored in wood or in the ground. Cell is provisioned with pollen (and nectar?), an egg laid, and cell is sealed over with circular pieces of leaves, clay or other materials that fit tightly into cavity. A few (Stelis, Coelioxys) are (clepto)parasitic, laying their eggs in the nests of other members of this family.
Non native species:
Florentine Wool-carder Bee, Anthidium florentinum. From Europe, 2012
Wool Carder Bee, Anthidium manicatum. From Europe, before 1963
No common name, Anthidium oblongatum. From Europe, 1995
No common name, Chelostoma campanularum . From Europe
No common name, Chelostoma rapunculi. From the Palaearctic
No common name, Coelioxys coturnix. From Europe, very recently
No common name, Hoplitis anthocopoides. From Europe
Mediterranean Wood Boring Bee, Lithurgus chrysurus. From Europe in 1978
No common name, Megachile apicalis. From Europe and the Middle East
Pale leafcutting bee, Megachile concinna. From Africa
No common name, Megachile lanata. From Ethiopian/Oriental regions
No common name, Megachile pusilla. Probably from southern Europe or North Africa
Alfalfa Leafcutter Bee, Megachile rotundata. From the Old World
Giant Resin Bee, Megachile sculpturalis. From Asia, 1990s
No common name, Megachile umbripennis. From Asia
No common name, Osmia caerulescens. From the Palaearctic
Hornfaced Bee, Osmia cornifrons. From Japan, 1970s
No common name, Osmia taurus. From SE Asia, 1970s
No common name, Pseudoanthidium nanum. From Europe, very recently, 2000s or 2010s
Print References
Chaetodactylus mite parasites of Megachilidae (O'Connor & Klimov 2009‒2012)
Internet References
Fact sheet (Serrano 2005‒2014)(6)