Nycticeius

{{Short description|Genus of bats}}

{{More citations needed|date=April 2017}}

{{Automatic taxobox

| image = Nycticeius humeralis Evening bat.JPG

| image_caption = Evening bat (Nycticeius humeralis)

| image_alt = A researcher is holding a Nycticeius humeralis Evening bat. The creature's wings are outstretched.

| parent_authority = Gervais, 1855

| display_parents = 3

| taxon = Nycticeius

| authority = Rafinesque, 1819

| type_species = Vespertilio humeralis

| type_species_authority = (Rafinesque, 1818)

| subdivision_ranks = Species

| subdivision = 3, See text.

| synonyms = Nycticea Le Conte, 1831

Nycticejus Temminck, 1827

Nycticeus Lesson, 1827

Nycticeyx Wagler, 1830

}}

Nycticeius is a small genus of bats in the vesper bat family, Vespertilionidae, and the only member of the tribe Nycticeiini. It contains three species, the evening bat (N. humeralis), the Cuban evening bat (N. cubanus) and Nycticeius aenobarbus. Some authorities include several other Old World species in Nycticeius, but recent genetic work shows that is a completely New World genus. Nycticeius is of Greek and Latin origin, meaning "belonging to the night".Watkins, L. C. (1972). Nycticeius humeralis. Mammalian species, (23), 1-4.

The Cuban evening bat is found only on the island of Cuba, and very little is known about this species. It is similar in appearance to N. humeralis, but is considerably smaller (4–7 grams).