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This is something from the tribe Plesiommatini. The eyes diverging ventrally are a very good character for this tribe. Compare with http://www.hr-rna.com/RNA/Rfly%20pages/Plesiomma%20page.htm

I don't think Plesiommatini has been recorded from Argentina, but Cystoprosopa semirufa was described from Montevideo, Uruguay. I'll have to look into the literature to see if I can get some more info. Great find!