Mesoleptus rotundiceps Cresson, 1872:167, ♂. Holotype ♂, Texas (G.W. Belfrage). - As Adelognathus rotundiceps: - Davis, 1897Davis, G.C. 1897. A review of the Ichneumonid subfamily Tryphoninae. Transactions of the American Entomological Society 24 (3/4):193-348. (distribution). - As Gelis rotundiceps: - 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 1. Symphyta and Apocrita (Parasitica). Smithsonian Institution Press, Washington D.C. 1-1198. (distribution).
Hemiteles pallidus Ashmead, 1889:406, ♂. Holotype ♂, Texas (Belfrage). Synonymized with Gelis rotundiceps (Cresson, 1872) by 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 1. Symphyta and Apocrita (Parasitica). Smithsonian Institution Press, Washington D.C. 1-1198.:408 (The holotype of pallidus has not been found, and it is my belief that its holotype is actually the same specimen as the holotype of rotundiceps. Although Ashmead's description of the propodeum does not agree perfectly with the holotype of rotundiceps, Ashmead is not renouned for his accuracy. There are at least two cases where it is known with certainty that Ashmead redescribed unique specimens from the Belfrage Collection which had already been described by Cresson). - Dalla Torre, 1901-1902Dalla Torre, C.G. 1901-1902. Catalogus Hymenopterorum hucusque descriptorum systematicus et synonymicus. — Volumen III: Trigonalidae, Megalyridae, Stephanidae, Ichneumonidae, Agriotypidae, Evaniidae, Pelecinidae. Pars II. Breitkopf & Härtel, Leipzig. VIII + 1141. (distribution).