Melangyna (Melanosyrphus) dichoptica Vockeroth  

Vockeroth (1969) erected this subgenus for his new species dichoptica. His diagnosis was:

"Eye bare. Male broadly dichoptic, front narrowed posteriorly to just before anterior ocellus and at this point with a transverse impressed line, then very slightly broadened to vertex, at narrowest point just over 1/7 head width. Front of female narrowed almost to vertex, without impressed line, at narrowest point just over 1/6 head width. Face only very slightly broadened below, produced strongly forward on lower half, tubercle well developed and extending slightly beyond oral margin; oral opening 2.5 times as long as broad. Front and face black, shining, the latter with two broad vittae of dense silvery pollen which extend almost to the oral margin and beneath which, in some specimens, traces of reddish ground-colour may be seen. Scutum shining black or dark metallic blue with a weakly pollinose median area on about anterior 1/5 and with notopleuron densely silver pollinose. Scutellum shining black or dark metallic blue with well defined pollinose band on about anterior 1/6. Pleura black or dark metallic blue, lightly pollinose with part of mesopleuron and of sternopleuron densely pollinose. Dosal and ventral katepisternal pile patches broadly separated throughout. Metacoxa without tuft of pile at posteroventral apical angle. Abdomen elongate, parallel-sided in male, slightly oval in female, shining black or dark metallic blue above and below with narrow anterior margins of terga 2 and 3 and a transverse arcuate or triangular band on each of terga 2 to 4 opaque black."