212 Bulletin American Museum of Natural History. [Vol. V, 



length and abundance toward the tip, where they conceal the annulations, and 

 form a well-defined pencil at the tip. Hind feet short and broad, with naked 

 soles. 



Measurements (from the fresh specimen) : Total length, 460 mm. ; head and 

 body, 208 ; tail to end of vertebrae, 252 ; pencil at tip, n ; hind foot, 35 ; ear 

 from crown, 24. 



Type and only specimen, No. ffff, & a d-> Princestown, Trinidad, April 6, 

 1893, coll. Frank M. Chapman. 



This specimen is in apparently rather worn pelage. The coat 

 is very short but thick and soft, and the underfur very woolly, 

 particularly on the ventral surface. Probably in fresh pelage the 

 color would be brighter and more yellowish rufous. 



The skull is that of a true Tylomys, and presents the following 

 measurements : Total length, 44.5 mm. ; basal length, 38 ; great- 

 est zygomatic breadth, 23.4 ; greatest mastoid breadth, 14.7 ; 

 least interorbital breadth, 6.4 ; length of nasals, 16.5; distance 

 from incisors to first molar, 12.7 ; length of upper molar series, 

 6.6 ; distance from posterior border of palatal floor to end of 

 pteygoid hamuli, 8.9 ; length of lower jaw (tip of incisors to 

 posterior border of condyle), 27 ; height of condyle, 12 ; length 

 of lower molar series, 6.7. 



This species has a close general resemblance in coloration to 

 the T. nudicaudatus Peters of Guatemala and Costa Rica, but it 

 has a hairy, relatively much longer, and very differently colored 

 tail. 



The single specimen was taken in the forest, at the entrance 

 to a hole which penetrated beneath the roots of a tree. 



13. Oryzomys speciosus, sp. nov. 



Pelage short (about 9 mm. long on the back), thick, soft, cottony below. 

 Color above yellowish rufous, darker reddish brown over the middle of the 

 back, where there are intermixed a few longer black-tipped hairs ; paler and 

 more yellowish along the sides. Below, pure white to the base of the fur. 

 Ears of medium size, rather narrow, evenly rounded on their posterior upper 

 border, dusky brown, well clothed with very short brownish hairs, which have 

 a slight reddish cast. Fore limbs yellowish like the sides of the body, as far as 

 the base of the toes, the toes lighter, buffy white ; palms yellowish flesh-color. 

 Hind limbs yellowish, like the flanks, as far as the base of the toes ; toes very 

 scantily haired, yellowish gray ; soles dusky, 6-tuberculate. Tail considerably 



