Identification, Images, & Information
For Insects, Spiders & Their Kin
For the United States & Canada
Michener, C. D. (1966). The classification of the Diphaglossinae and North American species of the genus Caupolicana (Hymenoptera, Colletidae). University of Kansas Science Bulletin, 44(20), 717.

cite:1838926
https://digitalcommons.usu.edu/cgi/viewcontent.cgi?article=1050&context=bee_lab_mi