Although this species is widespread in Middle America, it has been known previously from Nicaragua only by a specimen from "Chontales" (Miller, 1902:402). All of our specimens were captured in mist nets. Two adult females (one taken on 28 February and the other on 8 March) each carried a single embryo (13 and 18 mm in crown-rump length, respectively); a female taken in April was lactating and had a flaccid uterus suggesting relatively recent parturition. Adult females captured in the months of June, July, and August evidenced no sign of reproductive activity. Two of these were in dark, fresh pelage, but one captured on 24 June and another on 28 July were molting. In both individuals, active molt evidently had slowed or subsided and remnants of the old pelage (rich ochraceous orange) were confined to a narrow strip at the lateral edges of the body. We tentatively apply the subspecies name _fuscus_ to our Nicaraguan bats on geographic grounds; one of us (Smith) currently is investigating geographic variation in the genus _Pteronotus_. Pteronotus suapurensis (J. A. Allen, 1904) _Specimens._--_Chontales_: Cuapa, 1. _Matagalpa_: 3 mi E San Ramón, 24. _Zelaya_: Cara de Mono, 25 m, 4. This relatively poorly known monotypic species occurs from southern Veracruz to the Amazon Basin. It has been reported from several localities in Central America including one in Nicaragua (Goodwin, 1942a:88). Three pregnant females from near San Ramón (9 May) carried embryos that had crown-rump lengths of 27, 27, and 28 mm, and two netted on 24 April at Cara de Mono each had an embryo that measured 22 mm. All of our specimens are in bright pelage that is fulvous red in color. Micronycteris megalotis mexicana Miller, 1898 _Specimens._--_Carazo_: 3 km N, 4 km W Diriamba, 600 m, 5. _Granada_: Hda. Mecatepe [2 km N, 11.5 km E Nandaime], 5. _Managua:_ 5 mi NW Managua, 1. _Matagalpa_: Río Viejo, 7 mi WNW Darío, 4; 11 mi SE Darío, 1. _Zelaya_: S end Isla del Maíz Grande, 9. The individuals from Isla de Maíz Grande were shot on 30 June as they flew from small caves and crevices in rocky outcrops on the south end of the island. Of the three adult females obtained at that time, two were lactating; each was accompanied by a young, the forearms of which measured 19.7 (male) and 21.3 mm (female). Two adult males from Isla del Maíz Grande had testes 2 mm in length. TABLE 1.--Selected measurements of adults of two subspecies of _Micronycteris megalotis_ from Nicaragua. Superscript numbers indicate fewer specimens averaged than indicated in left-hand column. Table Legend: Col. A: Number of specimens averaged or catalogue number, and sex Col. B: Length of forearm Col. C: Greatest length of skull Col. D: Zygomatic breadth Col. E: Breadth of braincase Col. F: Length of maxillary toothrow