Ancyloscelis nigricormis Rodríguez & Roig-Alsina

(Figs. 6B, 7B, 8B, 11B, 13F)

Ancyloscelis nigricormis Rodríguez & Roig-Alsina, 2004: 355–356, figs. 3, 6, 10, 16, 18, 19 and 21 (Holotype male, Argentina, Salta, Sumalao, II-1994, M. Fritz, MACN, examined).

Diagnosis. This species is closely related to A. apiformis, from which it can be separated by the black scape and pedicel in both sexes, and the flagellum is also dark in the males; the pronotal lobe is also dark (Fig. 8B). This is the smallest species in Argentina, the length of the forewing being 3.9–5.7 mm. The inner tooth of the hind basitarsus is similar to that of A. apiformis, but less prominent and not hooked (Fig. 11B). The hidden sterna and genital capsule have been drawn by Rodríguez and Roig-Alsina (2004).

Distribution. Argentina, Bolivia and Paraguay. Argentina: province of Salta. Bolivia, department Santa Cruz. Paraguay, departments of Guayrá and Alto Paraguay.

New records. Bolivia, 3 ♂, Santa Cruz, 24 km S. Camiri, 3-I-1999, ME Irwin & FD Parker (BBSL) .