1893-] Allen and Chapman on Trinidad Mammals. 



205 



of the mainland. Some of them are obviously related more or 

 less closely to species described from western and southern 

 Brazil, though it is hardly probable that any of them will prove 

 strictly identical. While a large number of species of Muridae 

 have been recorded from Ecuador, Peru, Chili, southern Brazil 

 and the more southern parts of the continent, the literature of 

 the subject contains very few references to specimens from 

 northeastern South America, so that Mr. Thomas's pertinent 

 remarks on our ignorance of the Muridae inhabiting Trinidad 

 will apply with equal force to a large area of the adjoining por- 

 tions of the mainland. 



1. Mycetes, sp. A Howling Monkey was not uncommon 

 in the forests about two miles from the rest-house. At this 

 distance their howling or, better, roaring chorus, in the early 

 morning could frequently be heard. No specimens were secured, 

 but it is probable, as Mr. Thomas remarks, that the species is 

 M. seniculus. 



2. Saccopteryx bilineata (Temm.). Two specimens, male 

 and female adult. 



3. Saccopteryx leptura (Schreber). Five specimens, two 

 males and three females. 



In both of these species the females are larger than the males, 

 as shown by the following measurements : 



S. bilineata, 

 ti 



S. leptura, 



forearm, 46 ; 

 5L8 

 36.8 

 36; 



39- 6 

 41.9 



third metacarp., 45 ; 



49-5 I 



36; 



35-6; 



39-6; 



tarsus, 21.6. 

 23.9- 

 15.7. 

 15.3. 



" 17.8. 

 I7-3- 



All of the specimens show the two faint whitish dorsal stripes, 

 but in addition to its smaller size S. leptura is paler colored 

 throughout, including all of the membranes, and the wing mem- 

 brane is attached at the ankle joint instead of slightly above it, 

 as in S. bilineata. 



In the gloomy depths of the forest S. leptura was frequently 

 seen coursing for insects during the day. 



