Halictus pectoraloides Cockerell, 1895:64, ♀. ♀, Mesilla Valley, N.M. (leg. Ckll.). - Cockerell, 1897Cockerell, T.D.A. 1897. The bees of the genus Halictus found in New Mexico. I. Species without any green or blue. Transactions of the American Entomological Society 24:163-168. (distribution); Cockerell, 1898Cockerell, T.D.A. 1898. The insect visitors of flowers in New Mexico. - I. Zoologist ser .4: v. 2:78-81. (distribution); Cockerell, 1901Cockerell, T.D.A. 1901. Flower and insect records from New Mexico. Entomological News 12 (2):38-43. (distribution); Cockerell, 1906Cockerell, T.D.A. 1906. The bees of New Mexico. Transactions of the American Entomological Society 32:289-314. (distribution); Cockerell, 1907Cockerell, T.D.A. 1907. New american bees. - V. The Entomologist 40 (535):265-269. (distribution). - As Evylaeus pectoraloides: - 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). - As Lasioglossum pectoraloides: - 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).
Halictus pectoraloides beatulus Cockerell, 1918:262 - 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.:1961 ( listed as synonym of Evylaeus pectoraloides (Cockerell, 1895)).
Halictus grindeliae Cockerell, 1934:29 - 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.:1961 ( listed as synonym of Evylaeus pectoraloides (Cockerell, 1895)).