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Anywhere except South America there is a generic revision published within the past 60 years that will in combination with recent catalogues and checklists put most specimens into a genus. Nobody has looked at the South American fauna as a whole since Townsend in the 1930s and his classification is inadequate by modern standards. Townsend did not like to put more than one species in a genus and did not understand phylogenetic relationships. He may end up beating Robineau-Desvoidy in the number of junior synonyms proposed.

Another problem is, much literature is hard to find. The older volumes of Revista Brasileira de Entomologia are not online. Townsend's Manual of Myiology is a 12 volume set of books that I do not have, and would be of limited value with a specimen under a microscope.

It is hard to key this. A common character used in tribe Dexiini is what would be the nose of a human. It might be small or large, broad or narrow. The face is in shadow here. Then there may or may not be hairs on the proepisternum.

Of the genera in my region, Billaea looks a better match than Dinera. There are several species known from South America, reviewed by

Guimarães, J.H. 1977. A revision of the genus Paratheresia Townsend (Diptera: Tachinidae, Theresiini). Papéis Avulsos de Zoologia 30: 267–288. https://www.revis...iew/211105

If you come across a member of Tachinini (quite common in the Andes) you have a better chance.