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The only reliable way to distinguish it from the black-winged little yellow bat is through its karyotype. Genoways's yellow bat has a chromosome number of 42, while the closely related black-winged little yellow bat has chromosome numbers of 30, 32, 34, and 52.

It is found in the southern part of the Mexican state of Chiapas in the Pacific lowlands. It has been captured under the canopy of mature, second growth tropical forests. It is found at elevations of 20–50 m (66–164 ft) above sea level.

References:
A sympatric cryptic species of mammal: a new species of Rhogeessa (Chiroptera: Vespertilionidae). Systematic Biology, 33(2), 178-183.

https://www.iucnredlist.org/species/19680/21989676