Palpada (Trichopalpada) prietorum Mengual  

Palpada prietorum belongs to a small group of species, the ruficeps subgroup, which has the wing bare or nearly so, but shares some characters with the other member of the vinetorum species group, e.g. ciliate metatibia with apicolateral dens (tooth), and the pilose posterior anepimeron. There are 4 species in this subgroup: bistellata (Hull, 1935), prietorum Mengual spec. nov., ruficeps (Macquart 1842) and suprarufa Thompson, 1999 (see figs. 1–4). Palpada prietorum is most similar to ruficeps but is a smaller and darker species, and can be separated as follows: 1) wing dark on anterobasal 2/3, not hyaline; 2) wing microtrichose in cell R1 in area from fork of RS to end of vein Sc, not bare; 3) tegula and basicosta black, not pale; 4) metacoxa black pilose, not white pilose; 5) mesotibia black pilose, not mostly white pilose; 6) postalar callus black pilose on at least the anterior 3/4, not entirely orange pilose; 7) pleuron black pilose, not mostly or entirely pale pilose; 8) metasternum black pilose, not most white pilose; 9) 2nd and 3rd terga entirely dark pilose, mainly black pilose but more brownish orange anteromedially, not pale yellow pilose on basal 3/4 (2nd) to 2/3 (3rd) (Mengual and Thompson 2008).