96 NORTH AMERICAN FAUNA 75 



Specimen examined (1)— IkmS, 11.5kmEof San Miguel, 680 m [1 female, 

 USNM]. 



Molossus sinaloae 

 Allen's Mastiff Bat 



Allen's mastiff bats are found from Sinaloa to Suriname (Fig. 75). Hall (1981) 

 recognized two subspecies as occurring in Costa Rica, Molossus sinaloae sinaloae 

 in the north (including La Selva) and M. s. trinitatus in the south. Dolan (1982), 

 however, regarded M. sinaloae as a monotypic species. 



This mastiff bat has been taken in a wide variety of habitats in both wet and 

 dry forest regions, and it commonly roosts in buildings. It is completely insec- 

 tivorous. The reproductive cycle appears to be continuous (LaVal and Fitch 1977). 



Goodwin (1946) reported specimens from Alajuela Province. LaVal and Fitch 

 (1977) reported capturing 76 from a single colony roosting in a building in Puerto 

 Viejo. 



Specimens examined (23)— Puerto Viejo, Rio Sarapiqui, 70 m [1 male, 

 7 females, KU; 4 males, 11 females, UMMZ]. 



Fig. 75. Allen's mastiff bat, Molossus sinaloae. Photo by R. K. LaVal. 



