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Anthophila (Apoidea) - Bees

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On the Ecology and Systematics of Coloradan Bumblebees
By Byron, Peggy Ann
Thesis, University of Colorado, Boulder CO, 1980
193 pp. Contains descriptions of 20 species and subspecies of Bombus and 3 species of Psithyrus in Colorado, also a key to males and females to Colorado Bombus and Psithyrus. No images.

Common Native Bees in Gardens of California
By Jaime Pawelek and Jennifer Foltz Sweat
Urban Bee Lab, University of California Berkeley
This is a wonderful little flip book for identifying common bees found in California Gardens and some of their favorite flowers. The pictures are great and the information is concise and very helpful to those of us observing with a camera, and without a science background. Funding for the guide was provided in part by the Hind Foundation, NRCS-USDA, University of California Agriculture and Natural Resources, and Disney Worldwide Conservation Fund.

Systematics and biology of the bee genus Xeralictus (Hymenoptera: Halictidae, Rophitinae)
By R. R. Snelling and G. I. Stage
Contributions in Science, Natural History Museum of Los Angeles County, No. 451, pp 1-17, 1995

The Pollen-Collecting Bees of the Anthidiini of California (Hymenoptera: Megachilidae)
By Grigarick, A. A. and L. A. Stange
Bulletin of the California Insect Survey, University of California, 1968
    Full Text

Text of 113 pages, with 41 maps and 227 figures at the end of the paper.

Bumble Bees of the Eastern United States
By Sheila Colla, Leif Richardson, Paul Williams
USDA, 2011

On the identity of the adventive species of Eufriesea Cockerell in the USA: systematics and potential distribution of the ...
By Victor H. Gonzalez, Terry Griswold, Marianna Simões
Journal of Hymenoptera Research 55: 55-102, 2017
Full title: On the identity of the adventive species of Eufriesea Cockerell in the USA: systematics and potential distribution of the coerulescens species group (Hymenoptera, Apidae)
Full text (PDF)

The Carpenter Bees of California
By Paul D. Hurd, Jr.
University of California Press, 1955
A publication of the University of California, in the "California Insect Survey" series. It may be downloaded for free as a PDF (4.9 MB) at this link.

Like many of the publications in this series, it has much useful information, despite being perhaps a bit dated.

Revisions of the genera Townsendiella, Triopasites and Paranomada (Hymenoptera: Nomadidae)
By Linsley E.G.
Trans. Amer. Ent. Soc. 69: 93-106, 1943

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