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Anthidium emarginatum (Say, 1824)


Scientific Name: Anthidium emarginatum (Say, 1824)

Common Name: Emarginated Carder Bee


Megachile emarginata Say, in Keating, 1824: 352 [♀]

     Neotype , designated by Gonzalez and Griswold (2013: 295). USA, Nebraska, Kimball County, near Kimball, 6 July 1983, by M.C. Rohde [BBSL].

Anthidium montivagum Cresson, 1878: 110 [♀, ♂]. Synonymy by Gonzalez and Griswold (2013: 295).

     Lectotype , designated by Cresson (1916: 125). USA, Colorado [ANSP no. 2391].

Anthidium astragali Swenk, 1914: 16 [♂, ♀]. Synonymy by Grigarick and Stange (1968: 21).

     Holotype . USA, Nebraska, Sioux County, Bad Lands at mouth of Monroe Canyon, 6 June 1901, by M. Cary, on Homalobus tenellus [UNSM].

Anthidium rhodophorum Cockerell, 1925: 623 [♀]. Synonymy by Grigarick and Stange (1968: 21).

     Holotype ♀. USA, Colorado, While Rocks, near Boulder, 4 May 1925, by C.H. Hicks [AMNH].


Taxonomic Notes: When Cockerell (1925: 623) described A. rhodophorum Cockerell, he indicated that it was very close to A. atriventre Cresson (= A. atrifrons Cresson), which was synonymized underA. emarginatum (Say) by Griarick and Stange (1968: 21), but more recently under A. atrifrons by Gonzalez and Griswold (2013: 264). Gonzalez and Griswold (2013: 297) give a detailed account of the reason for the neotype designation for this species.

The type material of A. rhodophorum consisted of two specimens from Colorado, the first mentioned from White Rocks, near Boulder collected on 4 May 1925 by C.H. Hicks, the second from near Boulder by C. Custer. Gigarick and Stange (1968: 21) indicated the holotype female from Colorado was at the AMNH, which was not sufficient to distinguish either specimen; Gonzalez and Griswold (2013: 295) indicated the specimen from White Rocks was the holotype, though it does not seem the specimen was ever designated.

DNA Barcode Index Number (BIN): BOLD:AAJ2439

Biology: Davidson (1895) reported on several nests that were found in the ground in abandoned nests of Anthophora (Apidae), with the cells and nest plug made from trichomes of Pseudognaphalium canescens and Pseudognaphalium stramineum (Asteraceae). Hicks (1926) reported trichome-collecting behaviour of this species from stems of Cirsium undulatum (Asteraceae). As indicated by Gonzalez and Griswold (2013), at least some observations of this species may include A. atrifrons.

Distribution in Canada: Gibson 1917 [AB, MB]; Buckell 1950 [BC]; Grigarick and Stange 1968 [BC]; Sheffield and Heron 2019 [BC].

The Alberta and Manitoba records reported by Gibson (1917) have not been confirmed, though were not included in Sheffield et al. (2014) or Gibbs et al. (2023).


Sheffield CS, Frier SD, Dumesh D (2014) The bees (Hymenoptera: Apoidea, Apiformes) of the Prairies Ecozone, with comparisons to other grasslands of Canada. In: Giberson DJ, Cárcamo HA (Eds) Arthropods of Canadian Grasslands (Volume 4): Biodiversity and Systematics Part 2. 4. Biological Survey of Canada, Ottawa, 479 pp. [ISBN 978-0-9689321-7-9].

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.

Sheffield CS, Heron JM (2019) The bees of British Columbia (Hymenoptera: Apoidea, Apiformes). Journal of the Entomological Society of British Columbia 115: 44-85.

Cresson ET (1916) The Cresson types of Hymenoptera. Memoirs of the American Entomological Society 1: 1-141.

Grigarick AA, Stange LA (1968) The pollen-collecting bees of the Anthidiini of California (Hymenoptera: Megachilidae). Bulletin of the California Insect Survey 9: 1-113.

Gibson A (1917) The entomological record, 1916. Annual Report of the Entomological Society of Ontario 47: 137-171.

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.

Swenk MH (1914) Studies of North American bees. II. Family Stelididae. University Studies of the University of Nebraska 14(1): 1-36.

Buckell ER (1950) Record of bees from British Columbia: Megachilidae. Proceedings of the Entomological Society of British Columbia 46: 21-31.

Cockerell TDA (1925) Descriptions and records of bees.—CVII. Annals and Magazine of Natural History, Series 9 16(96): 621-629.

Davidson A (1895) The habits of Californian bees and wasps. Anthidium emarginatum, its life-history and parasites. Entomological News 6: 252-253.

Hicks CH (1926) Nesting habits and parasites of certain bees of Boulder County, Colorado. University of Colorado Bulletin 15: 217-252.

Keating WH (1824) Narrative of an expedition to the source of St. Peter’s River, Lake Winnepeek, Lake of the Woods, &c. &c. Performed in the year 1823, by order of the Hon. J.C. Calhoun, Secretary of War, Under the Command of Stephen H. Long, Major U.S.T.E. Vol. II. Philadelphia, USA: H.C. Carey & I. Lea—Chesnut Street, 253–378. [T. Say prepared the Appendix. Part I.— 1. Zoology].

Sociality: Solitary
Nesting: Cavity Renter, Ground
Pollen Specialization: Polylectic

Crop Preference: Not Available
Non Crop Preference: Not Available

Distribution: Alberta, British Columbia, Manitoba
Ecozone: Montane Cordillera, Western Interior Basin

Distribution Map