A re-examination of the type material of the five described species of Mimosoma Chamberlin, 1920, has revealed that only two species have been based on male specimens. The gonopods of these two, M. setosum Chamberlin, 1920, and M. glabrum Chamberlin, 1920, are illustrated, and a description is given. Brief notes on the characters of the three remaining species are added. Mimosoma is regarded to be a synonym of Eustrongylosoma Silvestri, 1896 (new synonymy).