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The key in Flies of China should include all Vietnamese species
of Mikia s. lat. It begins roughly

1a. 2-3 lateral scutellars, 3-4 dorsocentrals (some reduced),
acrostichals irregular, male with 1-3 orbitals, hind tibia usually
with three dorsal bristles ... 2

1b. Lateral scutellar absent, dorsocentrals 3+3, acrostichals 3+3;
cheeks with black bristles, male without orbitals, hind tibia
with 2 dorsal bristles ... remaining species

2a. Humeri, scutellum, and tergite 5 red or yellow, tergite 3
with 4-6 median marginals, first flagellomere shorter than pedicel,
male with 2-3 orbitals ... M. tepens

2b. Humeri and scutellum black, tergite 5 black or black and red,
first flagellomere about equal to pedicel, male with 1 orbital ... M. lampros

It is not stated if the antenna character applies to both sexes.

I just noticed the inner vertical bristles are not convergent,
unusual in tribe Tachinini.