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Assuming
Mydaea (Robineau-Desvoidy)


This genus is distinguished from its allies by having the third wing-vein setulose at base, fourth not curved forward at apex, tibia 3 without calcar, penultimate abdominal sternite in female with a number of short bristles, eyes of male subcontiguous, prealar bristle present, prosternum bare, face not buccate.

Assuming stpl 1:2
Tibia 3 with 3 av setae – orthonevra f. detrita, stpl 1:2, pra longer than 2nd ntpl seta, tibia 3 with 3 ad (Hennig) and 2 ad (Gregor et al)
3av for orthonevra f. detrita in both Hennig, Gregor et al., 2002


Fauna Europea
Norwegian mainland for Family Muscidae:


Norway + 3 species

Mydaea nubila Stein 1916 - Halteres mostly darkened, Hennig gives 2 p setae on tibia 2 I don't know the colour of the legs, he says that tibiae can be yellowish but nothing for the femora
Mydaea palpalis Stein 1916 - Legs black
Mydaea sootryeni Ringdahl 1928 - Legs black

Last 2 from Gregor et al., 2002