Perdita salicis Timberlake 1964

Timberlake 1964. A revisional study of the bees of the genus Perdita F. Smith, with special reference to the fauna of the Pacific coast (Hymenoptera, Apoidea). Pt. VI. University of California Publications in Entomology, 28 1964: 125-387

Timberlake 1929. New records and descriptions of bees of the genus Perdita (Hymenoptera). Journal of the New York Entomological Society, 37 1929: pp. 111-125