1893-] Allen and Chapman on Trinidad Mammals. 211 



fully adult there is little variation. The nasals end in an acute 

 V-shaped point, which projects beyond the fron to-maxillary 

 suture. The interparietal is convex posteriorly, nearly straight 

 or slightly convex on its anterior border, with the transverse 

 about twice the antero-posterior extent, or rather less. 



In cranial characters this species is much more nearly related 

 to N. apicalis Peters, from Guayaquil, than to N. squamipes 

 (Brants) ; the very largest skulls about equal the dimensions 

 given by Dr. Peters for that of N. apicalis. It also resembles 

 N. apicalis in its 5-tuberculate soles, but differs from it in its 

 darker coloration, smaller size, and relatively much shorter tail, 

 which is considerably shorter than the head and body, instead 

 of considerably longer as in N. apicalis. The tip of the tail is 

 not white, as was the case in the type of N. apicalis. 



N. palmipes differs from N. squamipes in having the soles 

 5-tuberculate instead of 6-tuberculate, and in the very different 

 form of the interparietal, which in N. squamipes is very much 

 narrower antero-posteriorly, and transversely much more ex- 

 tended. 



Mr. Thomas gives " Holocliilus squamipes Bts." from Trinidad 

 (presumably Nectomys squamipes Peters), but that species is un- 

 represented in the present collection. 



All the specimens secured were taken in the low, dense growth 

 near a small stream. 



12. Tylomys couesi, 1 sp. nov. 



Of the size and general coloration of T. nudicaudatus, but with the tail 

 uniform dusky, somewhat hairy and slightly tufted, instead of particolored and 

 naked as in T. nudicaudatus and T. panarnensis. 



Above nearly uniform cinnamon brown, everywhere punctated with black, 

 through the presence of longer black-tipped hairs overtopping the general 

 pelage. Below white, with a slight tinge of yellow, the white extending to the 

 base of the fur. Line of demarcation between the color of the dorsal and 

 and ventral surfaces well defined. Edges of the feet and toes soiled whitish. 

 Whiskers very long, black, the longest measuring 70 mm. Ears large, naked, 

 dusky. Tail rather longer than head and body, black from base to tip, nearly 

 naked basally, but scantily clothed with short blackish hairs, increasing in 



1 Named for Dr. Elliott Coues, in recognition of his important contributions to North 

 American mammalogy. 



