2OO Bulletin American Museum of Natural History. [Vol. XII, 



In E. urichi the spines are weaker than in E. trinitatis, and are 

 confined to a much narrower tract of the median dorsal area. 



E. urichi is based on a series of 21 specimens collected at Los 

 . Palmales and Quebrada Secca, near the northern coast of Vene- 

 zuela, 90 miles south of Cumana, at elevations of 2000 to 4000 

 feet, in November and December, 1898. About one half the 

 specimens are fully adult, and the remainder 'young adults,' 

 there being no very young specimens in the series. 



Echimys canicollis, sp. nov. 



Type, No. 15397, $ a d., Bonda, Santa Marta District, Colombia, April 20, 

 1899; Coll. H. H. Smith. 



Pelage of the dorsal region hispid, sparsely intermixed with weak slightly 

 grooved spines ; pelage of the sides and underparts softer but hairy and not 

 furry. Color of the upper parts, from the nape posteriorly to the rump, rather 

 pale yellowish brown, or pale golden brown, varied over the back with black- 

 tipped spines or spiny hairs, paler and grayer on the sides, including the region 

 at the base of the tail ; top of head and nape grayish, varied with black ; sides 

 of head and sides of neck rather clear gray, becoming paler on the cheeks ; lower 

 parts and inside of limbs white, the gray of the sides of the neck extending on 

 to the sides of the throat, and sometimes (especially in immature specimens) 

 meeting to form a brownish gray throat band ; upper surface of fore and hind 

 feet gray, often approaching whitish on the hind feet ; ears rather broad arid 

 low, brown, practically naked (short, grayish hairs are visible under a lens) ; 

 tail rather indistinctly bicolor, blackish above, the lower surface (about one 

 third of the circumference) dull flesh-color ; the tail is scantily haired, the hairs 

 partly (in some specimens wholly) concealing the annulations. 



The young in first pelage are dusky gray above, the hairs faintly tipped with 

 yellowish, darker along the middle of the back, grayer on the sides ; below 

 white, with sometimes a broad pectoral band of gray. 



Measurements. Type, total length, 425 mm. ; tail vertebrae, 178 ; hind foot, 

 43, with claws, 50. Seventeen adult males and 18 adult females present the fol- 

 lowing measurements : 17 males, total length, 396 (372-440) ; tail vertebras, 162 

 (155-185) ; hind foot (with claws), 50.5 : 18 females, total length, 366 (352-408) ; 

 tail vertebrae, 154 (134-175) ; hind foot, 47 (45-50). 



Skull (of type), total length, 54; basal length, 38; zygomatic width, 25 ; 

 mastoid width, 20.3; interorbital width, 12; length of nasals, 20; width of 

 nasals at middle, 6 ; crown length of : upper toothrow, 8 ; palatal length, 9 ; 

 length of lower toothrow, 9. 



This species is based on a series of 90 specimens, of which 45 

 are from Bonda, and the remainder about equally from Santa 

 Marta, Mamatoca, and other nearby points, ranging in altitude 



