Melangyna (Austrosyrphus) novaezelandiae (Macquart)  

This subgenus was erected by Vockeroth (1969), who designated Syrphus novaezelandiae Macquart, 1855 as type-species. Following Vockeroth (1969), Austrosyrphus species have eye bare; face slightly widened and rather prominent below, with well-developed tubercle, yellow to yellow-brown, densely pollinose, with broad black medial vitta; scutum shining black with notopleuron slightly pollinose; scutellum yellow-brown to dark brown, with well-defined pollinose band on about anterior 1/6; pleura black, moderately to densely pollinose; dorsal and ventral katepisternal pile patches broadly separated throughout; metacoxa without tuft of pile at posteroventral apical angle; terga 2 to 4 each with a pair of subtriangular, slightly oblique or (novaezelandiae only) transverse and almost sub rectangular dull yellow or yellow-orange maculae, those on terga 3 and 4 rarely narrowly confluent medially; and sterna usually yellow, sometimes with dark median markings.

The male genitalia of Austrosyrphus has: Surstylus extending caudad, rather slender, nearly parallel-sided or slightly swollen at mid length, broadly rounded apically. Sternite 9 with broad and deep posteroventral emargination; lingula very broad and almost parallel-sided on about basal half, then tapering to subacute apex, the apical half thick and convex dorsally, the basal half deeply excavated on dorsal surface; emargination without swelling beside base of lingula; apex of apicolateral process of sternite broad and bluntly rounded. Superior lobe short, dorsoventrally elongate, broadly rounded dorsally and posteriorly, thick basally and thinner but not at all compressed apically, with a blunt process bearing several very small irregular marginal teeth at posteroventral angle and with a single strong hook-like tooth at anteroventral angle; a very weak lateral pre apical ridge present, ending dorsally in a weak appressed tooth; outer surface with a few moderately strong setae, inner surface without pile. Aedeagal base in the form of a short non-compressed cylinder, the dorsal surface produced caudad well beyond the base of the distal portion. of the aedeagus, the lower surface produced ventrad on each side into a broad compressed ventrolaterally directed plate with the anteroventral angle slightly more produced and twisted strongly mediad. Distal portion of aedeagus nearly tubular but with posterodorsal surface distinctly flattened, the base usually slightly broadened, the apex only obscurely membranous, produced slightly forward but not otherwise expanded, with extremely minute spicules anteriorly at apex (Vockeroth 1969).