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Next day I've found it under that tree on fresh cow dang in company with another Mesembrina mystacea.
Both collected and I have trouble with species level ID.
My key divide M. intermedia and M. meridiana by foretarsus colour.
Both flies have dorsaly foretarsomers all black. Ventraly second fly (female) has only fore tar1 red, as it has to be for M. meridiana, but first fly (male) has ventraly all 1-5 fore tarsomer red, as M. intermedia. Also size of first fly is obviosly less.