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That's definitely not Sigmatomera (Chioneinae) but Lecteria s.str. (Limnophilinae). It's very difficult to suggest a species from images only, though; using the key in Alexander, 1969m we can only exclude species with uniformly darkened tarsi (calopus, fuscitarsis, both Brazi; retrorsa, Colombia). Check also the recent paper by Ribeiro and Blagoderov (2009) on rediscovery of L. calopus in Brazil (Zoosymposia 3: 235-243).

The same correction of generic name applies to the creature from Colombia in Paul Bertner's post:
https://diptera.i...d_id=71498