Ancyloscelis nigricormis Rodríguez & Roig-Alsina

Schaller, A. & Roig-Alsina, A., 2021, A revision of the bee genus Ancyloscelis (Hymenoptera: Apidae) in Argentina, Zootaxa 4980 (3), pp. 521-540 : 532

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) .