Specimens from Los Cocos (three males and two females) were captured in a mist net stretched across a large, quiet pool in a small stream. The banks supported well-developed gallery forest, the understory of which had been cleared for human habitation; grassland (grazed) and small stands of secondary forest obtained beyond the riparian habitat. Domestic ducks, a possible source of food, were observed sleeping along the bank of this stream and on top of large boulders situated in the stream. Males from this locality taken on 20 February, 4 April, and 18 July had testicular lengths of 5, 6, and 6.5 mm, respectively. Two adult females collected there on 4 April were reproductively inactive. An adult male (testes 6 mm) from near Condega was captured on 23 June in a daytime roost in a small, cave-like crevice (see account of _Peropteryx marcotis_), and one from northeast of Esquipulas (testes 5 mm) was netted on 14 March along a forest trail (see account of _Vampyressa pusilla_). Natalus stramineus saturatus Dalquest and Hall, 1949 _Specimens._--_Granada_: 6 km S Nandaime, 5. _Zelaya_: S side Río Mico, El Recreo, 25 m, 2. This funnel-eared species occupies an extensive geographic range (northern México to Brazil) but appears to be relatively rare in Middle America to the south of Guatemala. Our specimens represent the first of this species to be reported from Nicaragua. Both specimens from El Recreo, adult males, were caught by hand at night after they flew through an open door into a small room, possibly seeking insects that were swarming around a light bulb. Those from near Nandaime (three males, two females) were caught in a mist net set over the mouth of a well in which they were roosting; the well was approximately 2 m in diameter, and the water level was about 5 m below the rim. The females were not reproductively active (6 August). We have compared our Nicaraguan material with a number of Mexican specimens, including the holotype of _N. s. saturatus_ and topotypes of _N. s. mexicanus_. We concur with Goodwin (1959) that in México there are two rather distinct subspecies, between which a broad zone of intergradation obtains. Our Nicaraguan specimens agree most closely with _N. s. saturatus_, and, until additional comparative material is available from Middle America, we tentatively refer them to that race. Handley (1966b:770) and Starrett and Casebeer (1968:15), however, regarded _mexicanus_ as the appropriate name for specimens from Panamá and Costa Rica. Selected measurements of two males from El Recreo are: length of forearm, 41.2, 39.0 mm; greatest length of skull, 17.1, 16.5 mm; zygomatic breadth, 8.4, 8.5 mm; mastoid breadth, 7.7, 7.6 mm; breadth of braincase, 8.2, 8.1 mm; interorbital constriction, 3.2, 3.2 mm; length of maxillary toothrow, 7.3, 7.1 mm. Myotis albescens (E. Geoffroy St.-Hilaire, 1806)