LA SELVA-BRAULIO CARRILLO MAMMALS 117 



Fig. 92. Sumichrast's vesper rat, Nyctomys sumichrasti. Photo by B. L. Clauson. 



Vesper rats may be common in the forest at La Selva, but they are seldom 

 observed because of their nocturnal, arboreal habits. Fleming (1973) reported catch- 

 ing a Sumichrast's vesper rat at La Selva in primary forest. An adult and subadult 

 were collected by Findley in the laboratory buildings in July 1974. An adult male 

 captured on 7 August 1971 had fully scrotal testes measuring 14x7 mm. 



Specimens examined (3)— Finca La Selva, 3 km S of Puerto Viejo [1 female, 

 KU; 2 sex?, MSB]; 7.3 mi SE of Puerto Viejo [1 male, TTU]. 



