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Introduction
Myopa are brownish to blackish Conopids, which are immediately recognized by the large, inflated and whitish face, which extends far below the eyes. They are found near all kinds of flowering plants. M. tesselatipennis is often taken from flowering scrubs like Craetegus, where they sit on the twigs, on the hunt for hosts for their larvae. Others, like M. buccata, are also found visiting flowers of herbs, like Taraxacum. Their larvae are endoparasites of bees, bumble bees and wasps (Vespula vulgaris).
Key
1.b. Wing with black markings, at least cross vein at the basis of cel R blackened -> 6
3.a. Scutellum black; abdomen blackish with brown edges, for M. fasciata with yellowish dust -> 4
3.b. Scutellum reddish; abdomen reddish brown (like a broad Sicus). 11.5-15 mm. -> Myopa dorsalis Fabricius
Myopa dorsalis.
4.a. Wing: anal cell long; face under eyes bare -> 5
4.b. Wing: anal cell short, as in Dalmannia; face under eyes haired. 3.5-4 mm. -> Myopa morio Meigen
6.a. Cross vein at basis of cell R blackish -> 7
6.b. Cross vein at basis of cell R whitish; wing with a mix of white and black spots. 6-11 mm. -> Myopa buccata Linnaeus
Myopa testacea
8.a. Wing: cell R without a black spot -> 9
8.b. Wing: cell R with a black spot; snout very long. 8-11 mm. -> Myopa picta Panzer
9.a. Thoracic dorsum: median part black up to the scutellum; wing: black markings sharply defined. 7-8 mm. -> Myopa polystigma Rondani
9.b. Thoracic dorsum: median part black, but just before the scutellum turning brown -> 10
10.a. Abdomen: tergite 4, 5 and 6 with long hairs, which are at least as long as metatars 3, the long hairs at tergite 5 perpendicular on the surface, or with an angle of 45 degree -> 11