Genus Microstenus Szépligeti, 1916

Microstenus Szépligeti, 1916: 287 . Type species: Microstenus canaliculatus Szépligeti, 1916 .

Diagnosis. Clypeus (Fig. 3) wide and moderately convex, its apex weakly concave, without a median tooth. Hypostomal carina (Fig. 6) absent apically. Sternaulus (Fig. 9) evident, reaching middle coxa. Fore wing (Fig. 7) with vein 1cu-a basad of 1/M approximately 0.5 to 0.6 × length of 1cu-a. Propodeum (Fig. 11) evenly convex, smooth; lateromedian and lateral longitudinal carinae absent, pleural carina absent between anterior transverse carina and base of hind coxa; anterior and posterior transverse carinae strong; with a median and two sublateral longitudinal grooves between transverse carinae. Ovipositor sheath about 0.8 to 1.1 × as long as hind tibia. Lower valve (Fig. 15) with a dorsal lobe enclosing upper valve, apical with oblique ridges; apical of upper valve with wavy ridges.