Only two specimens of this small white-lined species have been reported previously from Nicaragua--one from 1 km NW La Gatiada, 1300 ft, Chontales (Davis _et al._, 1964:383), and the other from 3 mi NNW Diriamba, Carazo (Jones, 1964a:507). This bat was relatively rare in collections until the last decade or so. Handley (1966b:766) reported _V. helleri_ as abundant in the lowland areas of Panamá, and we found the same to be true in Nicaragua. We suspect that future investigations in Middle America will reveal this species to be a common member of lowland tropical communities. It is known as far north as southern Veracruz (Carter _et al._, 1966:494). Most of our specimens were captured in mist nets set over small streams bordered by gallery forest, or in banana groves. The range of ecological conditions in which this species was taken is represented by the semiarid environment of the Cosigüina Peninsula in northwestern Nicaragua and the humid tropical forest (secondary growth) in the vicinity of El Recreo in the Caribbean lowlands. Pregnant females were captured in March, April, June, July, and August, indicating that this species probably breeds throughout much of the year. Vampyrodes major G. M. Allen, 1908 _Specimens._--_Boaco_: Santa Rosa, 17 km N, 15 km E Boaco, 300 m, 8. _Chontales_: 1 km N, 2.5 km W Villa Somoza, 330 m, 2. _Zelaya_: S side Río Mico, 25 m, 6. This large white-lined stenodermine was known previously from Nicaragua by a single specimen from an unknown locality (J. A. Allen, 1910:112). All of our specimens were caught in mist nets, which were set over streams at Santa Rosa and near Villa Somoza, and in a banana grove at El Recreo. Two pregnant females, captured on 11 and 13 July at Santa Rosa, each carried an embryo (4 and 27 mm in crown-rump length, respectively); one of two other adult females captured there on 9 August also had an embryo (35 mm in length) but the other evidently was reproductively quiescent. Testes of adult males varied in length from 3 to 10 mm on the following dates (testicular lengths in parentheses): 25 February (10 mm); 21 March (8, 8 mm); 17 June (3, 4 mm); 13 July (6 mm); 27-28 July (4, 4 mm); 3 August (4 mm); 5 August (3 mm); 9 August (4 mm). We follow Starrett and Casebeer (1968:12) in the use of the specific name _major_, rather than _caraccioli_ as suggested by Cabrera (1958), Goodwin and Greenhall (1961), and Handley (1966b). Vampyressa nymphaea Thomas, 1909