Perdita haplura Cockerell, 1922:19, Holotype ♀, Sanderson, Texas, May 9, 1912 (U.S.N.M., No. 24896, leg. J.S. Mitchell); Danforth, 1996Danforth, B.N. 1996. Phylogenetic analysis and taxonomic revision of the Perdita subgenera Macrotera, Macroteropsis, Macroterella and Cockerellula (Hymenoptera: Andrenidae). The University of Kansas Science Bulletin 55 (6):635-692.:678, Holotype ♀ (NMNH, No. 24896). - Timberlake, 1960Timberlake, P.H. 1960. A revisional study of the bees of the genus Perdita F. Smith, with special reference to the fauna of the Pacific Coast (Hymenoptera, Apoidea). Part IV. University of California Publications In Entomology 17 (1):1-156. (distribution); Timberlake, 1962Timberlake, P.H. 1962. A revisional study of the bees of the genus Perdita F. Smith, with special reference to the fauna of the Pacific Coast (Hymenoptera, Apoidea). Part V. University of California Publications In Entomology 28 (1):1-124. (distribution); Timberlake, 1968Timberlake, P.H. 1968. A revisional study of the bees of the genus Perdita F. Smith, with special reference to the fauna of the Pacific Coast (Hymenoptera, Apoidea). Part VII. University of California Publications In Entomology 49:1-196. (distribution); Krombein et al., 1979Krombein, K.V., P.D. Hurd, D.R. Smith & B.D. Burks 1979. Catalog of Hymenoptera in America North of Mexico. Volume 2. Apocrita (Aculeata). Smithsonian Institution Press, Washington D.C. 1199-2209. (distribution); Danforth, 1996Danforth, B.N. 1996. Phylogenetic analysis and taxonomic revision of the Perdita subgenera Macrotera, Macroteropsis, Macroterella and Cockerellula (Hymenoptera: Andrenidae). The University of Kansas Science Bulletin 55 (6):635-692. (distribution).