Megischus cylindricus Westwood, 1851:230 - As Aguiarina cylindricus: - Ramos & Arias, 2018Ramos, Y.J.A. & D.Q. Arias 2018. Aulacidae, Gasteruptiidae y Stephanidae (Insecta, Hymenoptera) de Panamá. Tecnociencia 20 (1):27-34. (distribution); Añino & Quintero, 2018Añino Ramos, Y.J. & D. Quintero Arias 2018. Aulacidae, Gasteruptiidae y Stephanidae (Insecta: Hymenoptera) de Panamá. Tecnociencia 20 (1):27-34. (distribution); Añino Ramos, 2018Añino Ramos, Y.J. 2018. . Dissertation , , 1-48. (distribution). - As Hemistephanus cylindricus: - Aguiar, 2004Aguiar, A.P. 2004. Additions to the revision of the genus Hemistephanus Enderlein (Hymenoptera: Stephanidae), with inclusdion of four taxa and description of two new species. Papéis Avulsos de Zoologia 44 (2):13-43. (distribution).
Stephanus vadosus Schletterer, 1889:90 - Aguiar, 2004Aguiar, A.P. 2004. Additions to the revision of the genus Hemistephanus Enderlein (Hymenoptera: Stephanidae), with inclusdion of four taxa and description of two new species. Papéis Avulsos de Zoologia 44 (2):13-43.:19 ( listed as synonym of Hemistephanus cylindricus (Westwood, 1851)); Añino Ramos, 2018Añino Ramos, Y.J. 2018. . Dissertation , , 1-48.:31 ( listed as synonym of Aguiarina cylindricus (Westwood, 1851)).
Hemistephanus bolivianus Fritz & Scaramozzino, 1993:342, ♂. Holotype ♂, Bolivia: Santa Cruz de la Sierra, San José, I.1959 (leg. A. Martínez). - Aguiar, 2004Aguiar, A.P. 2004. Additions to the revision of the genus Hemistephanus Enderlein (Hymenoptera: Stephanidae), with inclusdion of four taxa and description of two new species. Papéis Avulsos de Zoologia 44 (2):13-43.:19 ( listed as synonym of Hemistephanus cylindricus (Westwood, 1851)); Añino Ramos, 2018Añino Ramos, Y.J. 2018. . Dissertation , , 1-48.:31 ( listed as synonym of Aguiarina cylindricus (Westwood, 1851)).