Neosilba concava Galeano-Olaya & Canal

Diagnosis: Neosislba concava belongs to the peltae species group characterized according to data of the previous species. The new species could be recognized because the junction of the filament and the C of the aedeagus is not clearly wider (Fig. 5D), filament spiculated just at the apex and base (Fig. 5D), by the 17 setulae along ¾ apical in the margin of the surstylus, in three groups 6 distally, 5 spaced medial and 6 posterior (Figs. 5A, B, E), and the posterodorsal border of the epandrium concave (Figs. 5B, E);

N. convexa differs by the posterodorsal border of the epandrium rounded; by the 10 equal spaced setulae in the margin of the surstylus and the filament slightly thinner; N. peltae differs by the posterodorsal border of the epandrium being rectangular, 7 setulae in the margin of the surstylus preceded by 4 widely spaced; the filament of the aedeagus is totally spiculated; N. mcalpiniei differs by the apex of the aedeagus being arrow-like shaped; N. parapeltae by the apex of the aedeagus crown-like shaped; N. ilehuense differs by the filament reaching beyond the base of the surstylus.