Platycheirus luteipennis

For terminology see

Speight’s Key to Genera of European Syrphidae with Morphological terms. Glossary of morphological terminology of adult Syrphidae, Steenis Picture key to Nearctic syrphid genera, Miranda et al. Size 8.7–10.1 mm (0.34–0.40 in)

Head The face is pushed forward and downward, covered with a thin grayish powder except for the shining median stripe on the tubercle. It is sparsely dusted creating minute oblique striations in the integument on the lateral sides.( see figure 2). The upper part of the face features a moderately strong median keel. The antenna is black, with the first flagellomere being orange on the underside (refer to the general anatomy of the head). Thorax The scutum and scutellum are shining and slightly coppery, adorned with short brassy yellow hairs. The sides are also shining, featuring short yellow to yellow-brown hairs. (Refer to the body anatomy section below.) Wing The cell c is bare from about the basal one-sixth, while cell bm is at least one-third bare. Additionally, cell cup is broadly bare on the basal one-third. (Refer to the wing anatomy section below.) The knob of the halter is orange. Legs The legs are mostly orange-brown, with the basal one-third to half of the mid femora typically featuring a blackish-brown to black preapical ring on each tibia. They are simple, lacking outstanding hairs or bristles. …