Perdita nigridia Timberlake, 1962:18, ♂♀. Holotype ♂, Salt Creek, Orocopia Mts., Riverside Co., California, March 20, 1927 (U.S. National Museum, No. 43,391, leg. Timberlake). - 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); Esperanza de Pedro, 2021Esperanza de Pedro, D. 2021. . :. (distribution); Nava-Bolaños & Osorio-Olvera, 2022Nava-Bolaños, A. & L. Osorio-Olvera 2022. Estado del arte del conocimiento de biodiversidad de los polinizadores de México. Revista Mexicana de Biodiversidad 93:1-77. (distribution).
Perdita sodalis Timberlake, 1968:101, ♂. Holotype ♂, Deep Canyon, Santa Rosa Mts., Riverside Co., California, March 29, 1963 (University of California, Riverside, leg. E.I. Schlinger). Synonymized with Perdita nigridia Timberlake, 1962 by Timberlake, 1980Timberlake, P.H. 1980. Supplementary studies on the systematics of the genus Perdita (Hymenoptera, Andrenidae). Part II. University of California Publications In Entomology 85:1-65.:32.