Genus Diostracus Loew, 1861

Diostracus Loew, 1861: 44. Type species: Diostracus prasinus Loew, 1861 (monotypy).

Sphyrotarsus Mik, 1874: 342. Type species: Sphyrotarsus argyrostomus Mik, 1874 (monotypy).

Asphyrotarsus Oldenberg, 1916: 193. Type species: Liancalus leucostomus Loew, 1861 (original designation).

Takagia Negrobov, 1973: 1520 (as subgenus of Sphyrotarsus Mik, 1874) (not Matsumura, 1942). - Negrobov 1978: pl. CLXI (as genus, in error). Type species: Sphyrotarsus stackelbergi Negrobov, 1965 (original designation).

Lagodechia Negrobov & Tsurikov, 1996: 632. Type species: Diostracus spinulifer Negrobov & Tsurikov, 1988 (monotypy).

Ozmena Özdikmen, 2010: 265 (new name for Takagia Negrobov, 1973, not Matsumura, 1942) (as subgenus of Sphyrotarsus Mik, 1874).

Diagnosis.

Medium to huge dolichopodid flies (males body length 3.4-7.6 mm, usually larger in females). Body stout, metallic green, always with pollinosity. Vertex weakly concave; upper occiput slightly concave. Scape with or without dorsal seta; arista subapical or sub-basal. Palpus rather large and loosely applied on proboscis, sometimes elongated, beyond the apex of proboscis in males, and relatively smaller in females. Proboscis bulky. Acr absent; four or six pairs of dc; one or two strong npl; scutellum with two strong sc, sometimes with marginal hairs. Crossvein m-cu longer than final section of 5th longitudinal vein. Legs and wings are often modified in males, which are usually the identical characters for groups or species. Abdomen cylindrical, with five visible segments; Sternite I or IV sometimes with produced process, and Sternite V usually split into pair of sclerites in males.