Archeosmylus Riek, 1953

Type species. Archeosmylus pectinatus Riek, 1953: 86 (by original designation).

Diagnosis. Forewing relatively small (less than 11 mm), apex usually rounded; costal area expanded basally, narrowed towards apex; subcostal veinlets mostly simple; pterostigma long; Sc area narrow; RP arising near base of wing with numerous pectinate branches (7–11), end twigging dense; M forked after the origin of RP1; CuA deeply forked; CuA with at least four pectinate branches; 1A and 2A pectinately branched near apex, 3A less so, relatively short; pterostigma very long and narrow; CuA with at least six pectinate branches.

Comments. Members of Archeosmylus are relatively small species (wing length <10 mm) with simplified venation and few medial vein branches. The absence of gradates is diagnostic for the genus although they are present in A. costalis (see Riek, 1955: fig. 21). The latter species is represented by an incomplete forewing and may belong to other genus and even family.