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Coelioxys alternatus Say, 1837


Scientific Name: Coelioxys alternatus Say, 1837

Common Name: Alternate Cuckoo Leafcutter Bee


Coelioxys alternata Say, 1837: 401 [♂‚,♀]

     Syntypes ♂‚,♀. USA, Indiana [presumed destroyed] 

Coelioxys texana vegana Cockerell, 1912: 166 [♂‚] [synonymy by Baker 1975: 664]

     Holotype ♂‚. USA, New Mexico, Beulah, 8000 ft., August [no year provided], by T.D.A. Cockerell [AMNH]

Coelioxys cockerelli Crawford, 1915: 108 [♀] [synonymy by Baker 1975: 664]

     Holotype ♀. USA, Colorado [Colo. 1462, C.F. Baker collection] [USNM no. 19963]

Coelioxys wisconsinensis Cockerell, 1925: 145 [♀,♂‚] [synonymy by Baker 1975: 664]

     Syntypes ♀,♂‚. USA, Wisconsin [University of Colorado Museum]


Species Notes

Crawford (1914: 148) previously identified his species, C. cockerelli as C. alternata.

The DNA Barcode Index Number (BIN) for this species is BOLD:AAJ6835.



Baker (1975) indicated that this species was a nest parasite of Megachile pugnata, which is widespread in Canada.



♀ body length: mm; head length: mm; head width: mm; forewing length: mm

♂‚ body length: mm; head length: mm; head width: mm; forewing length: mm


Extent of Occurrence (EOO) in Canada ( km2

Approximate Global Extent of Occurrence (EOO) ( km2

Index of Area of Occupancy (IAO) in Canada ( km2



Baker JR (1975) Taxonomy of five Nearctic subgenera of Coelioxys (Hymenoptera: Megachilidae). The University of Kansas Science Bulletin 50(12): 649-730.

Cockerell TDA (1912) Some parasitic bees (Coelioxys). The Canadian Entomologist 44(6): 165-170.

Cockerell TDA (1925) Bees of the genus Coelioxys in the collection of the California Academy of Sciences. The Pan-Pacific Entomologist 1(4): 145-151.

Crawford JC (1914) Some species of the bee genus Coelioxys. Annals of the Entomological Society of America 7: 148-159.

Crawford JC (1915) New North American Hymenoptera. Insecutor Inscitiae Menstruus. 3: 107-109.

Say T (1837) Descriptions of new species of North American Hymenoptera, and observations on some already described. Boston Journal of Natural History 1(4): 361-416.

Sociality: Parasitic
Nesting: Cavity Renter
Pollen Specialization: Not Applicable
Wintering Stage: Mature Larva

Crop Preference: Not Available
Non Crop Preference: Not Available

Distribution: Alberta, British Columbia, Manitoba, Ontario, Quebec, Saskatchewan
Ecozone: Boreal Shield, Mixwood Plains, Prairie, Western Interior Basin