(Figs 147–148, 287)

Species recognition. This species is distinguished from others with a spinuli-filled concavity by the concave ventral margin of the hind femur.

Description. Body length: 1.78 mm. Head: Frons light brown, second row of setae slightly concave. Flagellomere 1 rounded-oval, light brown. Palpus slightly enlarged, inflated (perhaps an artifact of decomposition), yellow. Thorax: Scutum light brown. Scutellum brown, with setae broken. Pleuron yellowish-brown. Costa 0.45 wing length. Halter yellow to light brown. Legs yellowish-brown. Forecoxa in lateral view yellowish-brown. Foretibia with 4 dorsal setae. Foretarsomeres slender, elongate. Midcoxa light brown. Hind coxa whitish-yellow. Hind coxal lobe yellow, only slightly developed. Posterior face of hind femur with basal group of peglike setae; ventral concavity short, rounded, filled with spinuli; with oval area of white membrane on basal margin and larger area on distal margin (Figs 147–148, 287). Abdomen: Abdominal tergite 1 light brown, tergites 2–6 dark brown, with yellow anterior and posterior margins. Venter of abdomen gray, with sparse setae. Male terminalia with epandrium yellowish-brown, hypandrium brown, and cercus yellow.

Distribution. Known from a single site in Amazonian Colombia.

Derivation of specific epithet. Named for one of the collectors of the holotype, Monica Ospina.

Holotype. ♂, COLOMBIA: Caquetá: PNN Chiribiquete, Rio Cuñare, 0.50°N, 72.62°W, 300 m, 29.x– 12.xi.2000, M. Ospina, E. Gonzalez, Malaise trap, CAP-951 [LACM ENT 133998] (IAVH).