Grandosmylus Makarkin, 1985

Type species. Grandosmylus centrasius Makarkin, 1985: 41 (by original designation).

Diagnosis. Female forecoxae with strongly curved processes; wings elongate ovoid; FW largely hyaline and veins uniformly pale-brownish; subcostal veinlets mainly forked, without interlinking crossveins; RP with 9–10 branches, some of them deeply forked; RP branches only slightly sinuous distally; crossveins numerous in basal half of radial area, inner gradate series absent, outer series present; M vein forked slightly distal to origin of RP1; CuA, CuP, A1 strongly pectinate; branches of A1 long, without interlinking crossveins; male genitalia with large gonarcus bearing a pair of very long dorsal processes, each terminating in paired acute denticles; female genitalia sternite 8 very short with paired short processes.

Comments. This genus is distributed in mountains of Central Asia (at elevations up to 3800 m). Like Parosmylus, it lacks an inner gradate series and can be differentiated by male genitalic features, especially the enlarged dorsal processes on the gonarcus.