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I'm inclined to consider this fly (as well as a similar Brazilian one elsewhere in the Forum) Raphiocera armata (Wiedemann). Fits imho the description in James, 1943 (Ann.Ent.Soc.Am. XXXVI: 376 as Basentidema coerulescens, sp.n.; synonymy in Pimentel&Pujol-Luz, 2001). Scape is not elongate so not a Heptozus (extralimital as well). As far as I know Lysozus Enderlein, 1914 mentioned here is a rather enigmatic genus.