28 NORTH AMERICAN FAUNA 75 



Abundant throughout lowland Costa Rica, S. bilineata occurs at La Selva both 

 in large colonies in hollow trees, and in smaller groups on the sides of buildings 

 and in buttresses of large forest trees. On 1 August 1983 at La Selva, three harems 

 of Saccopteryx were located by A. Alberts in a large "Ceiba." One harem con- 

 tained eight females, three with young; one contained five females, three with young; 

 and one contained four females, one with young. Males seemed to spend most of 

 their time at the territorial boundaries (A. Alberts, in litt.). 



Specimens examined (13)— Finca La Selva, 3 km S of Puerto Viejo, 70 m 

 [1 male, KU; 1 male, 1 female, LACM; 5 females, MSB]; Puerto Viejo, Rio Sara- 

 piqm, 100 m [1 male, 1 female, KU; 2 females, UMMZ]; 2.5 km SE of Puerto 

 Viejo [1 female, TCWC]. 



Saccopteryx leptura 

 Lesser White-lined Bat 



Lesser white-lined bats are found from Chiapas, Mexico, south through Cen- 

 tral America to eastern Brazil (Fig. 15). The species is monotypic. 



Population dynamics were studied extensively in Costa Rica by Bradbury and 

 Vehrencamp (1976). This species is less common than Saccopteryx bilineata in 

 most areas, and seems to prefer more open roosting sites. Group size is also much 

 smaller, but food habits and reproductive patterns seem similar. 



Although previously known from Panama and Nicaragua, this species was first 

 reported from Costa Rica by Starrett and Casebeer (1968). LaVal and Fitch (1977) 

 reported seven individuals from La Selva. We did not encounter this species in 

 Parque Nacional Braulio Carrillo. 



Specimen examined (1)— Puerto Viejo, Rio Sarapiqm, 300 ft [1 female, 

 UMMZ]. 



Family Noctilionidae 



Noctilio albiventris 

 Lesser Bulldog Bat 



Lesser bulldog bats are found from Chiapas. Mexico, to Argentina (Fig. 16). 

 The Costa Rican subspecies. Noctilio albiventris minor, is found throughout Cen- 

 tral America to northern South America. 



Primarily an inhabitant of wet tropical forests, this species forages for insects 

 mainly over rivers, streams, and wetlands. Although roosts are known from hollow 

 trees and caves, large colonies frequently are found in buildings. The reproduc- 

 tive cycle appears to be one of seasonal monestry (Hood and Pitocchelli 1983). 



Apparently the first published record of N. albiventris from Costa Rica was 

 that of Davis et al. (1964). who reported a single female from La Selva. LaVal 

 and Fitch (1977) also reported capturing only a single individual, a pregnant female, 

 in August. These bats, however, are common in the area and can be seen foraging 

 over the Rio Puerto Viejo. where we have netted them on several occasions, the 

 most recent of which was in January 1987. 



Specimen examined (1)— Puerto Viejo. Rio Sarapiqm. 300 ft [1 male. UMMZ]. 



Additional record (1)— 4 mi W of Puerto Viejo, 300 ft [1 female, TCWC]. 



