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Hi Eduardo,

Yes, I think you are correct, my bad: this must be bigoti! When I first saw this fly, I thought it was a particularly scruffy, somewhat off-colored Mallophora sylveirii (which seems to be the commonest species of Mallophora in Argentina)--forgetting about this species! Seems the difference in the longer hairs at the base of the abdomen are the best way to separate these two species: sylveirii has denser, yellower hair on the basal 3 tergites, while bigoti has thinner, whiter bands of hair present on just the basal 2 tergites.

Cheers, Eric.