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I'm slowly learning my way around Ag.Canada's Manual of Nearctic Diptera

A wings well developed
B wing broader
C antennal flagellum consolidated;
palpus tiny
D lunule present
E thorax not flattened
F greater ampulla present, vibrissa present
lower & upper calypteres present
59 ordinary flies pg114
60 meron without bristles [the meron is roughly located above coxa II and III. It is a pleural sclerite of the thorax (as well as the coxopleural streak) and not belonging to parts of the legs. The row of bristles in your picture belonging to coxa II. Compare with fig. 66 on p. 26 in the MND(1). The Northern Kentucky University provides a pictured key to identify families of Calyptrata. The Anatomical Atlas of Flies(2) may help also. Bjoern Rulik]
68 A1 not intersecting A2
69 Palpus present. Crossveins r-m and dm-cu widely separated; crossvein bm-cu complete
70 A1 not reaching margin: Muscidae pg.451 vol.2

1 Anepimeron bare
15 no middorsal bristle; Sc very close to R over most of its length
18 Hind coxa with a row of setae near lower margin of posterior surface
19 Many inclinate frontal bristles present; hind tibia with posterodorsal bristles: Thricops (Trichopticus) 14 spp widespread

But: images of Thricops on the web all seem to be orange except for T.nigrifrons. Might it be that?
Any other suggestions?

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(2nd image)