The genus Archytas was erected in 1867 with A. bicolor as type. In 1888 Van der Wulp established the genus Nemochaeta with dissimilis as type and in 1903 gave a key to the Cenrtral American species. Since that time no treatment of the species occurring in America has been presented and the description of the species are for the most part very unsatisfactory, resulting in uncertainty as to their identity. In most cases it is impossible to determine the described species without an examination of the types and until such time as these have been examined they must be considered unrecognizable.