28 Thomas A New Spiny Rat from Venezuela. 



ily developed, but abruptly ceasing at the fronto-parietal suture, the 

 parietal itself being quite smooth. Pterygoid processes broadly spatulate. 

 Palatal foramina large, the posterior ends continued backward as two 

 gutters on to the front of the palate. Bullte small, their antero-posterior 

 length measured laterally into the angle formed by the paroccipital pro 

 cess, only 9.4 mm. 



Dimensions of the type measured in the flesh: 



Head and body, 240; tail, 190; hind foot, s. u. 45, c. u. 48. 



Skull, greatest length, 56; basilar length, 39.2; zygomatic breadth, 27; 

 nasals, length, 20.4; breadth of muzzle at fronto-premaxillary suture, 

 10; inteorbital breadth, 13.1; breadth on ridges above squamosals, 19.3; 

 interparietal, 8.5 x 13.7; diastema, 12; palate from henselion, 19: palatel 

 foramina, 7.5 x 3.7; length of upper tooth series, 8.7. 



Hob. La Guaira, Venezuela. 



Type. Male. U. S. N. M., No. 102,731. Original number 81. Col 

 lected 8th July, 1900 by Messrs. Lyon and Robinson. A paratype in 

 British Museum, No. 1.1.5.3, presented by the United States National 

 Museum. 



This species is evidently closely allied to P. trinitati* and its conti 

 nental representatives of P. uricki and P. m.inca>. It differs from all 

 three by its much paler color, and from the first and second by its nearly 

 white feet. 



From P.-eentralis and allies it is also separated by the absence of pa 

 rietal ridges, in which respect it approaches the Peruvian P. simonsi. 



The paratype is rather more brown and less rufous than the type, sug 

 gesting a specimen in a rather more youthful state of pelage. 



