A revision of the bee genus Ancyloscelis (Hymenoptera: Apidae) in Argentina Author Schaller, A. Author Roig-Alsina, A. text Zootaxa 2021 2021-06-02 4980 3 521 540 journal article 5944 10.11646/zootaxa.4980.3.4 c50f1eed-a142-4d1b-a54b-b92dbb30e458 1175-5326 4897130 F5B71805-4E78-4B69-9146-797676C1A513 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 ) .