I think I have this one keyed out to Coboldia fuscipes but would appreciate confirmation/correction of the ID. The “logic” is laid out below.
Thanks for the help

Features from the MND key (1) that I think I can see in these photos, couplet numbers in ()
toScatopsinae
1) Scutum without a U-shaped ridge, C not swollen at junction with R4+5. Eyes holoptic in both sexes
3) Wing with false vein present midway between M, and CuA

to Swammerdamellini
4) Stem of halter with setae: wins without setae on CuA.
5) Anterior spiracular plate triangular, longer than high, with spiracle relatively small. CuA, with two sharp bends. R4+5 not extending beyond middle of wing

to Coboldia fuscipes
17) Fork of M longer than stem; R4+5 terminating in C far from R. Male with seven visible abdominal segments
18) Male with tergite 7 produced posteriorly as a narrow spatulate process