In the accounts that follow, departments in Nicaragua are listed alphabetically, but localities within each department are arranged from north to south; elevations are given in meters or feet, depending on which was used on specimen labels. All specimens are in the Museum of Natural History of The University of Kansas unless noted otherwise. We are indebted to Drs. Charles O. Handley, Jr., and Ronald Pine of the U.S. National Museum (USNM) for lending us certain critical specimens. ACCOUNTS OF SPECIES Saccopteryx leptura (Schreber, 1774) Two specimens from El Paraíso, 1 km N Cosigüina, 20 m, Chinandega, on the Cosigüina Peninsula, provide the fourth locality of record for this white-lined bat in Nicaragua. Jones (1964a:506) and Davis _et al._ (1964:375) earlier reported a total of eight specimens from the departments of Managua and Zelaya. The species is known as far north in Middle America as Chiapas (Carter _et al._, 1966:489). Our two bats, both females, were shot on the evening of 1 March 1968 as they foraged around a yard light. One carried an embryo that measured 8 mm (crown-rump), whereas the other was reproductively inactive. Peropteryx macrotis macrotis (Wagner, 1843) Four females (one young and three adult) captured 5 km N and 9 km E Condega, 800 m, in Madriz, on 23 June 1964, provide the first record of this small sac-winged species from Nicaragua. The bats were shot from daytime roosts in small, well-lighted, cave-like spaces formed among immense blocks of granite in a small patch of tropical deciduous forest surrounded by extensive pine-oak woodland. None of the adult females was reproductively active. _Glossophaga soricina_, _Diphylla ecaudata_, and a large nursery colony of _Desmodus rotundus_ were found in association with the _Peropteryx_. Measurements of our specimens agree closely with those reported for material from El Salvador (Felten, 1955:284) and Costa Rica (Starrett and Casebeer, 1968:3-4). Noctilio labialis labialis (Kerr, 1792) _Specimens._--_Boaco_: 4 km W Teustepe, 140 m, 9. _Chontales_: Hato Grande, 13 km S, 8 km W Juigalpa, 60 m, 49. _Rivas_: 4 km S, 1.5 km E Alta Gracia, 40 m, Isla de Ometepe, 1; Finca Amayo, 13 km S, 14 km E Rivas, 40 m, 4. _Zelaya_: S side Río Mico, El Recreo, 25 m, 1; Cara de Mono, 50 m, 2. This species has been reported previously from Nicaragua by several authors. All our specimens were netted over small streams or shot as they foraged; parts of scarabids and lepidopterans were found in the mouths of several individuals shot at Finca Amayo. Twenty-six of 31 autopsied females taken in April were pregnant, each containing a single embryo--average crown-rump length 16.7 (5-26) mm. Testes of 15 males collected in April had an average length of 4.6 (2-7) mm, those of four taken in June, 5.2 (4-6) mm.