Proceedings of the Nebraska Academy of Sciences
So far as known, all forms belonging to North America, excluding Cuba, are included in this paper. The material upon which it is based is, primarily, that found in the collection of the University of Nebraska. Other material was kindly loaned by the following institution and persons: Leland Stanford Jr. University; Prof. C. V. Piper, Agric. Coll., Pullman, Wash.; Dr. L. 0. Howard, U. S. Entomologist, and Mr. W. H. Ashmead, U. S. Nat. Mus.; Prof. Theo. D. A. Cockerell, East Las Vegas, N. M.; Prof. Carroll Fowler, Univ. of California; Prof. J.M. Aldrich, Univ. of Idaho; Mr. S. N. Dunning, Hartford, Conn.; Messrs. C. T. Brues and A. L. Melander, Univ. of Texas. Due acknowledgments are made to all for their very kind assistance.
Crawford, J. C. Jr., "North American Bees of the Genus Agapostemon Guerin" (1901). Co. Paper 172.