Syndyas Loew. The 1857

Syndyas Loew, 1857

Genus diagnosis and redescription in Chvála, 1983: 99.

Species with holoptic eyes. Third antennal segment elongate ovoid with apical arista. Proboscis strong, directed forward. Hind femur generally thickened, club-shaped hind tibia and thickened hind first tarsomere. Basal section of vein M, the vein separating the two basal cells scarcely visible (distinct in both Hybos and Syneches).

The species resemble one another in leg setation, general body and leg colour. Colour of wing (clear, yellowish or brownish tinged), presence or absence of a wing stigma, length of the discal cell in relation to length of basal cells are reliable characters. The shape of the fore tibia (thickening caused by the development of the tibial gland), hind femur, hind tibia, hind tarsomere 1 are also useful characters. The male genitalia are quite distinct, but the genitalia of few species have been figured and several species are only known from the holotype female.