(Figs. 2 A-F)

Type data: Holotype ♂. COLOMBIA, Tolima, Cajamarca. 04°26’267”N, 75°29’261”O, 2444 m, 03.I.2006, M. R. Castañeda & A. Osorio. In McPhail traps (MEN-UT).

Etymology: Named after its type locality (Department of Tolima, Colombia).

Diagnosis: Neosilba tolimensis belongs to the major group based in the male terminalia, less than two times longer than wide in lateral view (1:1.6) and hemispherical shape (Figs. 2A, B); the new species has the epandrium as long as wide (1:1.1), triangular-shape paramere (Fig. 2E), elongated and globe-shape gonopodites (tapering), surstylus distally expanded over the epandrium and with 5 prensisetae at each side (Figs. 2C, D), filament of the aedeagus slightly S-shape in lateral view, section C slightly wider than the filament in lateral view and spiculated in their junction (Figs. 2B, F). The hemispherical-shape of the male genitalia of the new species is similar with those in the parva group, however, the species in the parva group has a short filament of the aedeagus (it does not reach the base of cerci) and wider. The new species is the sixth species in the major group and it could be separated from the other as follow: N. fuscipennis differs by a pair of heavy, triangular tooth-like projections near the mesoposterior margin, section C of the aedeagus and filament same width, and surstylus with 6-7 prensisetae at each side. N. plana differs by filament being flat in ventral view and gonopodite along with rolled up margins and surstylus with 4 prensisetae at each side; N. major differs by paramere being finger-shaped, section C of the aedeagus and filament same width, the aedeagus reaching beyond the apex of the cerci and surstylus with 10-11 prensisetae. N. dimidiata differs by paramere thin and long in ventral view and surstylus with 7-8 prensisetae at each side; N. longicerata differs by section C of the aedeagus and filament same width, the aedeagus reaching beyond the apex of the cerci and surstylus with 7-8 prensisetae at each side.

Description: Body length 5.92 mm long, 1.85 mm wide at pteropleura. Head: 1.58 mm wide, 1.51 mm high, 0.96 mm long; front 0.38 mm wide at lunule, 0.53 mm lower ocelar triangle; lunula with 10 setulae; postpedicel 0.83 mm long, 0.21 mm wide in lateral view; arista 1.28 mm long, longest setulae of the arista 0.038 mm long; subvibrissal area with more than 20 setulae. Thorax: 2.22 mm long, 1.85 mm wide at pteropleura; anepisternum with 5 anterodorsal and 6 posterior bristles; scutellum with 4 setulae between anterior and posterior bristles; without setulae before anterior bristle; fringes of calypteres with 10 brown setae; Wing 5.55 mm long, 2.22 mm wide, hyaline. Abdomen: 2.74 mm long. Male terminalia: 0.69 mm long, 0.44 mm wide; epandrium 0.43 mm long, 0.38 mm wide (1.33 times as long as wide) in lateral view; irregular and globe-shape gonopodite, turn to aedagus; paramere porrect, triangular-shape and spiculated; surstylus with 5 prensisetae at each side; aedeagus with section C slightly wider than filament in lateral view and spiculated at the junction; filament slightly S-shaped and apex slightly widened and spiculated; cerci 0.12 mm long, 0.09 mm wide in ventral view.

Host: unknown.