38 NORTH AMERICAN FAUNA 75 



Micronycteris daviesi 

 Davies' Large-eared Bat 



Davies' large-eared bats are known from scattered localities ranging from Hon- 

 duras to Peru and Amazonian Brazil. This monotypic species is sometimes placed 

 in the separate genus Barticonycteris . 



Little is known about the natural history of Micronycteris daviesi. Specimens 

 have been caught in mist nets in mature forest (Hill 1964). Tuttle (1970) reported 

 three individuals in a hollow tree roost in Peru. No information is available on 

 food habits or reproductive pattern. 



This species is known from Costa Rica only by specimens collected at La Selva 

 by us in the early 1970's (LaVal 1977), and by a single adult we netted and released 

 there at 1930 h on 26 March 1986. A bat fly, Trichobius yunkeri (one female) 

 was obtained from M. daviesi at La Selva. 



Specimens examined (2)— Finca La Selva, 3 km S of Puerto Viejo, 70 m 

 [1 male, KU; 1 male, MSB]. 



Micronycteris hirsuta 

 Hairy Large-eared Bat 



Hairy large-eared bats occur from southern Honduras to Amazonian Brazil 

 (Fig. 24). This monotypic species is most often collected in forested habitats, 

 although Handley (1976) reported it in yards as well. These bats are known to 

 roost in hollow trees, under bridges, in buildings, and in other manmade struc- 

 tures (Goodwin and Greenhall 1961). Wilson (1971) reported this species to be 

 primarily insectivorous, but it consumes a variety of fruits during the dry season. 

 There are some data suggesting the usual phyllostomid bimodal reproductive pattern 

 (Wilson 1979). 



Goodwin (1946) listed two specimens from Palmar and two specimens from 

 Pozo Azul, and tentatively designated the latter as the type locality. Gardner et al. 

 (1970) added a fifth specimen from Rincon de Osa on the Osa Peninsula. LaVal 

 and Fitch (1977) reported four individuals from La Selva. 



Specimens examined (3)— 2.5 km SE of Puerto Viejo [1 male, CM]; Finca 

 La Selva, 3 km S of Puerto Viejo [2 females, MSB]. 



Micronycteris megalotis 

 Brazilian Large-eared Bat 



Brazilian large-eared bats occur from Tamaulipas and Jalisco, Mexico, to 

 southern Brazil (Fig. 25). In Costa Rica, two subspecies are recognized: Micro- 

 nycteris megalotis mexicana from the Pacific side and M. m. microtis from the 

 Caribbean lowlands. This arrangement is based on few specimens (Gardner et al. 

 1970), and a study of geographic variation in this species would be useful. 



This species uses a variety of habitats and occurs across a wide elevational 

 range (Gardner et al. 1970). Many roosting sites, some of them unusual, have been 

 reported for this species (Handley 1976): caves, mines, hollow trees, logs, stumps, 

 buildings, bridges, wells, culverts, under roots, under rocks, and in large mam- 



