When describing huttoni (as milleri) I noted that this species had all the essential characters of Platycheirus, sensu lato, except that male prolegs were not modified. Many other species are similarly characterized and the genus group name Eocheilosia Hull is associated with one of these species. Hence, I use this name for those species of Platycheirus with unmodified male prolegs. The determination of whether modified male prolegs is a primitive or derived trait must await a world revision of the genus Platycheirus and the identification of its sister-group. However, despite the phylogenetic status of Eocheilosia, the group is distinctive morphologically and zoogeographically. About a dozen more species are known and await description.