2023-09-132023-09-132010McDonough, M.M., Lim, B.K., Ferguson, A.W., Brown, C.M., Burneo, S.F., & Ammerman, L.K.. 2010. Mammalia, Chiroptera, Emballonuridae, Peropteryx leucoptera Peters, 1867 and Peropteryx pallidoptera Lim, Engstrom, Reid, Simmons, Voss and Fleck, 2010: Distributional range extensions in Ecuador. Check List, 6(4). https://doi.org/10.15560/6.4.639https://doi.org/10.15560/6.4.639https://hdl.handle.net/2346/96053cc-byWe reevaluate vouchered records of Peropteryx leucoptera in Ecuador with regard to the morphologically similar and newly described species, P. pallidoptera. The western-most distributional occurrence of P. pallidoptera is documented. Additionally, we describe a new record of P. leucoptera collected at Palma Roja, Cuyabeno Faunistic Reserve in Sucumbíos Province, Ecuador that represents the first record for this species in Sucumbíos Province and the northern-most distributional occurrence for Ecuador. © 2010 Check List and Authors.engArticle