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The genus is one of the most typical for the area, with 58 Neotropical spp. known so far. Although venation is not clearly visible, I think we can put a name on this: Polymera (s.str.) hirticornis (Fabricius, 1805). Here we can see what is mentioned in Alexander, 1913d (Proc. U. S. Nat. Mus. 44: 532): head and palpi mostly orange-yellow, scape and pedicel brownish-yellow, flagellomeres darker, antennae longer than body, pronotum yellow, prescutum, scutellum and mediotergite mostly brown, pleurae brown and (anteriorly) yellow, femora with brown subapical ring, hind tarsi white, wing brown with conspicuous pale yellow cross-band.

I quote the original description from Fabricius, 1805 (Systema antliatorum..., p. 46), recapitulated in Wiedemann, 1821 (Diptera Exotica, Pars I, p. 37)

Ater alis fuscis: fascia albida, antennis longis, verticillato pilosis.
Antennae corpore longiores, nigricantes, multiarticulatae: articulis pilis longioribus verticillatae; articulo primo longiore, ferrugineo. Thorax ater, antice ferrugineus. Abdomen compressum, nigrum, subtus ferrugineum. Alae fuscae; fascia lata alba. Pedes elongati, testacei.

P.S. Not recorded from French Guiana, but known from Guyana (Edwards, 1934b, Ann. Mag. Nat. Hist. (10) 14: 635 )