Genus: Osmia Panzer, 1806
Subgenus: Allosmia Tkalců, 1974
Common name: none
Osmia (Allosmia) are non-metallic bees ranging in body length from 7.5–11 mm. They commonly have pale to red pubescence that forms tergal fasciae. Males vary greatly in size. The large males are often larger than the females (Michener 2007).
(modified from Michener 2007)
Male O. (Allosmia) may be confused with male O. (Erythrosmia) due to the broad, basal depressions on S6 and the carinate hind coxae (Michener 2007). They can be differentiated by the number of segments on the maxillary palpus: 5 on O. (Allosmia), 4 on O. (Erythrosmia) (Michener 2007). It has been recommended that these subgenera be merged due to the similar characteristics (Michener 2007).
Osmia (Allosmia) are generalists, and have been observed visiting Fabaceae, Convolvulaceae, Brassicaceae, Caryophyllaceae, Asteraceae, Boraginaceae, Cistaceae, Lamiaceae, Resedaceae, Papaveraceae, Campanulaceae, and Oxalidaceae (Banaszak and Romasenko 1998; Müller 2018b).
Osmia (Allosmia) construct the cells in their nests in abandoned snail shells. Partitions and nest plugs are often made out of chewed leaf materials. Sometimes the chewed leaf material is mixed in with stones, broken snail shells, and dirt. Shells are then often buried in the ground or moved and hidden under rocks or vegetation (Westrich 1989; Müller 2018).
Osmia (Allosmia) contains nine species (Müller 2018b). None are known to occur in the U.S. or Canada.
There are no known invasives.