Identification, Images, & Information
For Insects, Spiders & Their Kin
For the United States & Canada
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
Cite: 594792 with citation markup [cite:594792]
Full text (87MB)

Above link is defunct -
Here's a link to the PDF. Smithsonia Research Online