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From these pictures, I could not say more (I won't say: get a closeup !).

There is actually an article from 2002 on Tabanidae feeding on crocs in the Amazons.
http://www.scielo.br/pdf/mioc/v97n1/4360.pdf
Four species are mentioned there.

It is not Tabanus and it does not look like Stenotabanus.

So possible match would be Phaetabanus nigriflavus.

I know the genus, not the species. Genus could be a match indeed and nigriflavus would not be a bad name for this species.


Theo