Scientific Name: Macropis nuda (Provancher, 1882)

Common Name: Macropis nuda


*Eucera nuda Provancher, 1882a: 174 [♀].

     Lectotype ♀ [designated by Sheffield and Perron 2014: 136]. CANADA, Quebec, Chicoutimi [ULQC no. 851].

Macropis morsei Robertson, 1897: 338 [♂, ♀] [synonymy by Mitchell 1960: 527].

     Lectotype ♂ [designated by W.E. LaBerge, in Webb 1980: 118]. USA, Massachusetts, Winchendon, 5 July 1892, by A.P. Morse [INHS]. 

Macropis clypeata Swenk, 1907: 293 [♂] [synonymy by Snelling and Stage 1995: 29].

     Holotype ♂. USA, Nebraska, Sioux County, Warbonnet Canon, 13 July 1901, by M. Cary, on Pentstemon [UNSM].

Macropsis clypeata Muma, 1952: 19 [lapsus calami].


Species Notes

The cleptoparasite of this species was assessed as Endangered in Canada by the Committee on the Status of Endangered Wildlife in Canada (COSEWIC) (COSEWIC 2011).

The DNA Barcode Index Number (BIN) for this species is BOLD:AAD9500.



Patton (1879) was among the first to recognize and detail the relationship of Macropis bees to Lysimachia. Rozen and Jacobson (1980) and Cane et al. (1983) studied the nesting and mating behaviours in detail, the former describing the immature stages. This species, like all bees of the genus Macropis, is a oligolege on oil producing flowers of the genus Lysimachia (Popov 1958; Cane et al. 1983; Michez and Patiny 2005; Dötterl and Schäffler 2006), but visits a number of other genera for nectar. This species is likely the main host for the cleptoparasitic bee, Epeoloides pilosulus in Canada (Sheffield et al. 2004; Sheffield and Heron 2018).



♀ 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 (http://geocat.kew.org/): 2,215,318 km2

Index of Area of Occupancy (IAO) in Canada (http://geocat.kew.org/): 544 km2



Cane JH, Eickwort GC, Wesley FR, Spielholz J (1983) Foraging, grooming and mateseeking behaviors of Macropis nuda (Hymenoptera, Melittidae) and use of Lysimachia ciliata (Primulaceae) oils in larval provisions and cell linings. American Midland Naturalist 110(2): 257‑264. https://doi.org/10.2307/2425267

COSEWIC (2011) COSEWIC Assessment and Status Report on the Macropis Cuckoo Bee Epeoloides pilosulus in Canada. Committee of the Status of Endangered Wildlife in Canada, Ottawa. http://www.registrelep-sararegistry.gc.ca/document/

Dötterl S, Schäffler I (2006) Flower scent of floral oil-producing Lysimachia punctata as attractant for the oil-bee Macropis fulvipes. Journal of Chemical Ecology 33(2): 441‑445. https://doi.org/10.1007/s10886-006-9237-2

Michez D, Patiny S (2005) World revision of the oil-collecting bee genus Macropis Panzer, 1809 (Hymenoptera: Apoidea: Melittidae) with a description of a new species from Laos. Annales de la Société entomologique de France (N.S.) 41(1): 15‑28. https://doi.org/10.1080/00379271.2005.10697439

Mitchell TB (1960) Bees of the Eastern United States. Volume 1. North Carolina Agricultural Experiment Station Technical Bulletin 141: 1-538.

Popov VB (1958) Peculiar features of correlated evolution of two genera of bees—Macropis and Epeoloides (Hymenoptera, Apoidea)—and a plant genus Lysimachia (Primulaceae). Entomological Review 37: 499‑519.

Provancher L (1882) Faune Canadienne. Les Insectes Hyménoptères. Naturaliste canadien 13: 168-175.

Robertson C (1897) North American bees−descriptions and synonyms. Transactions of the Academy of Sciences of St. Louis 7: 315-356.

Rozen JG, Jacobson NR (1980) Biology and immature stages of Macropis nuda, including comparisons to related bees (Apoidea, Melittidae). American Museum Novitates 2702: 1‑11.

Sheffield C, Heron J (2018) A new western Canadian record of Epeoloides pilosulus (Cresson), with discussion of ecological associations, distribution, and conservation status in Canada. Biodiversity Data Journal 6: e22837. https://doi.org/10.3897/BDJ.6.e22837

Sheffield C, Perron J (2014) Annotated catalogue of the bees described by Léon Provancher (Hymenoptera: Apoidea). The Canadian Entomologist 146(2): 117-169. https://doi.org/10.4039/tce.2013.64

Sheffield C, Rigby S, Smith R, Kevan P (2004) The rare cleptoparasitic bee Epeoloides pilosula (Hymenoptera: Apoidea: Apidae) discovered in Nova Scotia, Canada, with distributional notes. Journal of the Kansas Entomological Society 77(3): 161-164. https://doi.org/10.2317/0310.23.1

Snelling RR, Stage GI (1995) A revision of the Nearctic Melittidae: the subfamily Melittinae (Hymenoptera: Apoidea). Los Angeles County Museum Contributions in Science 451: 19-31.

Swenk MH (1907) The bees of Nebraska. III. Entomological News 18: 293-300.

Webb DW (1980) Primary insect types in the Illinois Natural History Survey Collection, exclusinve of the Collemboa and Thysanoptera. Illinois Natural History Survey Bulletin 32(2): 55‑191.


Sociality: Solitary
Nesting: Ground
Pollen Specialization: Narrow Oligolecty
Wintering Stage: Mature Larva

Crop Preference: Not Available
Non Crop Preference: Lysimachia terrestris, Symphoricarpos occidentalis, Solidago canadensis, Dalea candida, Apocynum sp., Taraxacum officinale, Apocynum cannabinum, Lysimachia ciliata, Oenothera villosa, Apocynum androsaemifolium

Distribution: Alberta, British Columbia, Manitoba, New Brunswick, Nova Scotia, Ontario, Quebec, Saskatchewan
Ecozone: Atlantic Maritime, Boreal Shield, Mixwood Plains, Montane Cordillera, Pacific Maritime, Prairie, Western Interior Basin

Distribution Map