Compiled and Edited by:
Nancy B. Simmons and Andrea L. Cirranello
American Museum of Natural History

Your search for Nycticeius resulted in 3 species-level matches:

Nycticeius Rafinesque, 1819. J. Phys. Chim. Hist. Nat. Arts Paris 88: 417.

Vespertilio humeralis Rafinesque, 1818

Nycticeius aenobarbus (Temminck, 1840).
Monographies de Mammalogie 2: 247.
Temminck's Mysterious Bat

Vespertilio aenobarbus

“Amérique méridionale”

Unknown; Carter and Dolan (1978) have suggested that the type and only known specimen is probably not from South America

CITES - Not Listed (2023). IUCN - Data Deficient (2008).

Listed as a synonym of Myotis albescens by many authors following Miller and Allen (1928), but clearly distinct at both the genus and species level; see Husson (1962) and Carter and Dolan (1978). The latter authors suggested that this species probably belongs with Nycticeius, but its status remains unclear. If the holotype originated in the Old World, this taxon might be referable to Scotoecus, Scotorepens, or Scoteanax.

References:

Carter, D.C., and P.G. Dolan 1978.  Catalogue of type specimens of Neotropical bats in selected European museums. Special Publications, The Museum, Texas Tech University 15: 1-136. Read volume.

Husson, A.M. 1962. The bats of Suriname. Zoologische Verhandelingen 58: 1-282. Read article.

Miller, G.S., Jr., and G.M. Allen. 1928. The American bats of the genera Myotis and PizonyxBulletin of the United States National Museum 144: 1-218. Read article.

Temminck, C.J. 1840. Monographies de Mammalogie, Tome Second. A. Bertrand, Leiden: 392pp. Read volume.

Nycticeius cubanus (Gundlach in Peters, 1861).
Monatsb. K. Preuss. Akad. Wiss. Berlin 1861: 150.
Cuban Evening Bat

Nycticeius humeralis (Rafinesque, 1818).
Am. Mon. Mag. 3(6): 445.
Evening Bat