Identification, Images, & Information
For Insects, Spiders & Their Kin
For the United States & Canada

Genus Triepeolus


A taxonomic key to mature larvae of cleptoparasitic bees (Hymenoptera: Apoidea)
By Rozen J.G., Jr.
Am. Mus. Novitates 309: 1-27, 2001

Principal sunflower bees of North America with emphasis on the southwestern United States
By Hurd P.D., LaBerge W.E., Linsley E.G.
Smiths. Contr. Zool. 310, 1980
Full text (87MB)

Bees of the eastern United States
By Mitchell T.B.
Tech. Bull. (NC Agric. Exp. Sta.): No. 141 (538 pp.), 1960; and No. 152 (557 pp.), 1962
Full text (in 8 PDF files)

The bee genera of Eastern Canada
By L. Packer, J.A. Genaro, C.S. Sheffield
Canadian Journal of Arthropod Identification 3, 2007

The bees of Colorado (Hymenoptera: Apoidea: Anthophila)
By V.L. Scott, J.S. Ascher, T. Griswold, C.R. Nufio
Natural History Inventory of Colorado 23: vi+100 pp., 2011
Full text
List of ~950 spp. in 66 genera with county-level records

Bees of the World
By C. O'Toole & A. Raw
Blandford. 192 pp., 1999

Bees of Wisconsin (Hymenoptera: Apoidea: Anthophila)
By A.T. Wolf & J.S. Ascher
The Great Lakes Entomologist 41: 129-168, 2009

The Biology and External Morphology of Bees: With a Synopsis of the Genera of Northwestern America
By W. P. Stephen, G.E. Bohart, and P.F. Torchio
Agricultural Experiment Station, Oregon State University-Corvallis, 1969
Full Text here.

An excellent resource with very detailed discussions of bee morphology, behavior, and biology---from identification to genus, to in-depth coverage of (a surprisingly diverse variety of) nest architectures. Very readable, even though largely written at a technical level. Many helpful diagrams throughout. In particular, nearly every couplet of the key to genera is accompanied by illustrations for clarifying the characters and terms being discussed.

I find this book to be a very interesting and helpful reference...only wish it included all of western (and not just northwestern) America!