94 



NORTH AMERICAN FAUNA 75 



Myotis riparius 

 Riparian Myotis 



Myotis riparius. a monotypic species, is found from Honduras to Uruguay. 

 It occupies a wide elevational range, and habitats include both forested and savan- 

 nah regions. Roosting sites are not known. Like other members of this genus, Myotis 

 riparius are strictly insectivorous. At La Selva, the reproductive cycle is monestrous 

 (LaVal and Fitch 1977). 



LaVal (1973a) reported specimens from Limon and San Jose Provinces. He 

 found the species common at La Selva, where he captured 78 (LaVal and Fitch 

 1977). 



Specimen examined (1)— Finca La Selva, 3 km S of Puerto Viejo, 70 m 

 [1 male, KU]. 



Rhogeessa tumida 

 Central American Yellow Bat 



Central American yellow bats are found from Oaxaca and Tamaulipas, Mex- 

 ico, to Brazil (Fig. 73). Rhogeessa tumida has been considered a monotypic species, 

 although the degree of chromosomal and morphological variation present suggests 

 that several biological species may be represented (LaVal 1973b). 



Almost all types of habitats found within its range are occupied by R. tumida, 

 which occurs from sea level to 1,500 m in Costa Rica (LaVal 1973b). They are 

 known to roost in buildings (Goodwin 1946), and are insectivorous. Reproductive 

 data suggest a limited breeding season, but are too few to understand the cycle. 



The first record for Costa Rica was that of Sanborn (1932) from Guanacaste 

 Province. Goodwin (1946) reported these specimens from Puntarenas Province. 

 LaVal and Fitch (1977) captured one at La Selva. Our three specimens came from 

 mist nets set across a small stream in primary forest. 



Specimens examined (3)— 11 km S, 4.5 km W of Puerto Viejo, 270 m 

 [2 females, USNM; 1 female, UNA]. 



Family Molossidae 



Molossus bondae 

 Bonda Mastiff Bat 



Bonda mastiff bats are known from Honduras to Colombia, Ecuador, Vene- 

 zuela, and Guyana (Fig. 74). The species is monotypic, and seems to be limited 

 to forested regions in the Caribbean versant in the northern part of its range. Col- 

 onies commonly roost in buildings. The diet is made up completely of insects, which 

 are taken on the wing. Little is known of reproduction, but pregnant females have 

 been recorded in August and January in Costa Rica (LaVal 1977). 



First reports of this species from Costa Rica were by Gardner et al. (1970), 

 based on specimens from Cartago and Limon Provinces. LaVal (1977) reported 

 a colony roosting under the roof of a building in Puerto Viejo. We captured and 

 released an adult male and female at La Selva in June 1982. We mist-netted a single 

 individual in Braulio Carrillo over a quiet pool in a small stream flowing through 

 a recently cleared pasture. 



