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Platycheirus (Platycheirus) immarginatus (Zetterstedt)
Genus: PlatycheirusSubgenus: Platycheirus (Platycheirus)
Species very similar to Platycheirus perpallidus Verral, 1901. In the male, this species is almost indistinguishable from P. immarginatus. Platycheirus perpallidus can exhibit a row of five or six, long bristly (black, or yellowish, or some of each) pili, postero-dorsally, on the profemur, as in P. immarginatus. But, in P. perpallidus these bristly pili each have a diameter distinctly less than the basal width of the clump of tangled white hairs that occurs at the base of the femur, posterodorsally. In P. immarginatus each of the long, black, bristly pili present on the postero-dorsal edge of the profemur has a diameter even greater than the basal width of that clump of tangled white pili. The female of P. perpallidus is most easily distinguished from that of P. immarginatus in having an almost continuously pale lateral margin to the abdominal terga (this may be darkened by post-mortem discolouration), whereas in P. immarginatus the lateral abdominal margin is almost continuously (and widely) black (Speight 2010).