310 Mr. O. Thomas on new Neotropical 



number of adult examples that I have lately had the oppor- 

 tunity of examining that I think they should receive a special 

 subspecific name. In his admirable monograph of Central 

 American Squirrels Mr. Nelson has also referred to these 



Neacomys guiance, sp. n. 



Very similar to N. spinosus, but conspicuously smaller. 



Fur of medium length ; hairs and spines of back about 

 8 mm. long. General colour dark fulvous, heavily lined with 

 blackish ; head and fore-quarters darker ; sides brighter 

 fulvous, especially in front of the hips. Lower flanks greyer, 

 an ochraceous line edging the white of the belly. Under 

 surface pure sharply defined white throughout, the hairs white 

 to their bases. Lips and chin also white. Outer side of 

 fore limb greyish fulvous, of hind limb clearer fulvous ; inner 

 side of limbs white. Upper surface of hands and feet dull 

 white. Tail of medium length, nearly naked, brown above, 

 whitish below proximally, darkening terminally. 



Skull similar to that of iV. spinosus, but smaller 

 throughout. 



Dimensions of type (measured in the flesh) : — 



Head and body 64 mm. ; tail 67 ; hind foot 18-5. 



Skull: greatest length 20; basilar length 15; length of 

 nasals 7 ; interorbital breadth 4 ; breadth of brain-case 10 ; 

 diastema 5*5 ; palatal foramina 3 ; length of upper molar 

 series 2"5. 



Hab. Demerara River, British Guiana. Alt. 120 feet. 



T(/pe. Old male. Original number 27. Collected 21st 

 July, 1905, by Mr. S. B. Warren. One specimen. 



The occurrence of Neacomys in Guiana is quite a new 

 discovery^ the nearest locality from which the genus has been 

 recorded being Bogota. The species may be readily 

 recognized by its small size, and especially by its small skull 

 and teeth. 



Coendou pruinosus, sp. n. 



A small thickly furred black-and-grey species, with two 

 sorts of spines as in C. vestitus. 



Size about as in C. couiy. Pelage consisting of (1) the 

 normal spines, about 25 mm. in length, contined to the upper 

 surface and sides, not occurring on the belly ; (2) long bristle- 

 spines, attaining 100 mm. in length, at base nearly as thick 

 as the true spines, but tailing off terminally into a long 

 * P. Wash. Acad. Sci. i. p. 78 (1890). 



