Cheilosia impressa - a Cheilosia with black legs, hairy eyes and no erect face hairs can only be impressa So this species can be done from photos, a yellow tinge to wing base is also a good pointer on females.
Eumerus funeralis - sadly Eumerus can't be done from photos, but this one turned out to be funeralis.
Eupeodes corollae - corollae is the only species where the yellow markings on abdomen reach the sides, so this species is identifiable from a photo.
Eupeodes luniger - males with the yellow on the abdomen not reaching the sides are generally too difficult to identify from a photo, this one turned out to be the commonest species in luniger.
Melangyna arctica - although some Melangyna are easy to identify, arctica is not and you really need a photo of the frons to take this one closer to its identity, a specimen is the only safe way to put a name to this photo.
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