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Syrphidae
Platycheirus (Carposcalis) stegnus (Say)
Nomenclature
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Genus: PlatycheirusSubgenus: Platycheirus (Carposcalis)
Species:
Platycheirus (Carposcalis) stegnus (Say)
SUMMARY
Following Vockeroth (1990), Carposcalis species (= stegnus group) have slender legs slender; profemur posteriorly with fine pile, ventrally at base sometimes with a few stiff setae; pro- and mesotibiae posteriorly on at least apical half with a single row of short and rather weak to long and strong black bristles; face slightly or moderately produced below, with pruinosity bearing distinct subshining punctures or oblique ripples or with pollinosity uniform except on tubercle; usually without keel between antennal bases; abdomen with paired subrectangular to subtriangular silvery to submetallic maculae on terga 2-4, the maculae sometimes with obscure or distinct dull orange background.