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Hoplitis truncata truncata (Cresson, 1878)


Scientific Name: Hoplitis truncata truncata (Cresson, 1878)

Common Name: Truncate Small-Mason Bee


Alcidamea truncata Cresson, 1878: 108 [♂].

     Holotype ♂. USA, Georgia, by Morrison [ANSP no. 2252].


Taxonomic notes: The ♀ was known to Cockerell (1910: 90) who compared it to his Hoplitis mescalerium Cockerell, 1910, described from the female, but was described in full by Michener (1947: 280).

Michener (1947: 281) recognized Hoplitis mescalerium Cockerell, 1910 (reported from Arizona, Colorado, New Mexico) as a subspecies of H. truncata (Cresson, 1878) based on its slightly larger size, coarser punctures, darker tegula, in additional to morphological differences in the clypeus of the female, and antennae of the male; it does not occur in Canada. He (Michener 1947: 282, 1954: 39) also indicated that intermediate forms occurred in Colorado, Nebraska, South Dakota, and Wyoming).

DNA Barcode Index Number (BIN): BOLD:AAA7121

Biology: Moretti et al. (2021) reared a single specimen from a trap-nest in a home garden in Toronto.

Distribution in Canada: Michener 1947 [ON, QC]; Hurd and Michener 1955 [BC]; Mitchell 1962 [QC]; Sedivy et al. 2013 [Canada]; Rowe 2017 [ON, QC]; Moretti et al. 2021 [ON]; Nelson et al. 2021 [AB]; Martini 2022 [MB]; Gibbs et al. 2023 [MB].


Cresson ET (1878) Descriptions of new North American Hymenoptera in the collection of the American Entomological Society. Transactions of the American Entomological Society 7: 61-136.

Mitchell TB (1962) Bees of the Eastern United States. Volume 2. North Carolina Agricultural Experimental Station Technical Bulletin 152, Raleigh, 557 pp.

Gibbs J, Hanuschuk E, Miller R, Dubois M, Martini M, Robinson S, Nakagawa P, Sheffield CS, Onuferko T (2023) A checklist of the bees (Hymenoptera: Apoidea) of Manitoba, Canada. The Canadian Entomologist 155: E3.

Michener CD (1954) Descriptions and records of North American Hoplitis and Anthocopa (Hymenoptera, Megachilidae). The Pan-Pacific Entomologist 30(1): 37-52.

Hurd PD, Michener CD (1955) The megachiline bees of California. Bulletin of the California Insect Survey 3: 1-247.

Michener CD (1947b) A revision of the American species of Hoplitis (Hymenoptera, Megachilidae). Bulletin of the American Museum of Natural History 89(4): 257-318.

Rowe G (2017) A taxonomic revision of the Canadian non-Osmia Osmiini (Hymenoptera: Megachilidae). MSc Thesis, York University, Toronto. xv + 321 pp.

Nelson CJ, Frost CM, Nielsen SE (2021) Narrow anthropogenic linear corridors increase the abundance, diversity, and movement of bees in boreal forests. Forest Ecology and Management 489: 119044

Cockerell TDA (1910) New American bees.—IX. The Entomologist 43(562): 90-92.

Sedivy C, Dorn S, Müller A (2013) Molecular phylogeny of the bee genus Hoplitis (Megachilidae: Osmiini)– how does nesting biology affect biogeography? Zoological Journal of the Linnean Society 167(1): 28-42.

Martini M (2022) Pollinator biodiversity and interaction networks in anthropogenic systems roadside verges and transmission line easements as pollinator habitat in Manitoba, Canada. MSc Thesis, University of Manitoba, Winnipeg, Manitoba, xi + 241 pp.

Moretti M, Fontana S, Carscadden KA, MacIvor JS (2021) Reproductive trait differences drive offspring production in urban cavity-nesting bees and wasps. Ecology and Evolution 11: 9932–9948.

Sociality: Solitary
Nesting: Cavity Renter
Pollen Specialization: Polylectic
Wintering Stage: Mature Larva

Crop Preference: Not Available
Non Crop Preference: Not Available

Distribution: Manitoba, Ontario, Quebec, Saskatchewan
Ecozone: Boreal Plains, Boreal Shield, Mixwood Plains, Prairie

Distribution Map