Stelis australis Cresson, 1878:92, ♀. Holotype ♀, Georgia (leg. Morrison). - As Heterostelis australis: - Thorp, 1966Thorp, R.W. 1966. Synopsis of the genus Heterostelis Timberlake (Hymenoptera: Megachilidae). Journal of the Kansas Entomological Society 39 (1):131-146. (distribution). - As Heterostelis australis australis: - Mitchell, 1962Mitchell, T.B. 1962. Bees of the Eastern United States. Volume II. Technical bulletin (North Carolina Agricultural Experiment Station) 152:1-557. (distribution); Thorp, 1966Thorp, R.W. 1966. Synopsis of the genus Heterostelis Timberlake (Hymenoptera: Megachilidae). Journal of the Kansas Entomological Society 39 (1):131-146. (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). - As Protostelis australis: - Parker & Griswold, 1993Parker, F.D. & T.L. Griswold 1993. A new species of Protostelis from Mexico (Hymenoptera: Megachilidae). The Pan-Pacific Entomologist 69 (4):329-331. (distribution). - As Stelis australis australis: - Pascarella, 2006Pascarella, J.B. 2006. The bees of Florida. . (distribution).
Heterostelis australis floridensis Mitchell, 1962:33, ♂♀. Allotype ♂, Levy Co., Fla. (Fla. State Plant Board, leg. H.V. Weems, Jr.); Holotype ♀, Levy Co., Fla., July 13, 1954 (Fla. State Plant Board, leg. H.V. Weems, Jr.). Synonymized with Protostelis australis (Cresson, 1878) by Parker & Griswold, 1993Parker, F.D. & T.L. Griswold 1993. A new species of Protostelis from Mexico (Hymenoptera: Megachilidae). The Pan-Pacific Entomologist 69 (4):329-331.:331. - Mitchell, 1962Mitchell, T.B. 1962. Bees of the Eastern United States. Volume II. Technical bulletin (North Carolina Agricultural Experiment Station) 152:1-557. (distribution); Thorp, 1966Thorp, R.W. 1966. Synopsis of the genus Heterostelis Timberlake (Hymenoptera: Megachilidae). Journal of the Kansas Entomological Society 39 (1):131-146. (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). - As Stelis australis floridensis: - Pascarella, 2006Pascarella, J.B. 2006. The bees of Florida. . (distribution).