Article XXVIII. NEW MAMMALS FROM VENEZUELA 

 AND COLOMBIA. 



By J. A. ALLEN. 



Peramys brevicaudatus dorsalis, subsp. nov. 



Type, No. 16126, $ ad., Ciudad Bolivar, Venezuela, Dec. 19, 1899; 

 coll. S. M. Klages. 



Three adults, taken at Ciudad Bolivar in December, have been 

 compared with the type of P, brevicaudatus orinoci Thomas, from 

 which they differ in the upper surface being dark brown instead of 

 "pale grey," and the under surface deep buff instead of "pale buffy," 

 the hairs dingy gray basally instead of "dark slaty." 



The male type measures: Head and body, 219 mm.; tail vertebrae, 

 79; two adult females measure, respectively, 180 and 190 in total 

 length; tail vertebras, 67 and 69. The corresponding measurements 

 for the type of orinoci, "a slightly immature male," are in and 75. 

 Skull (type), basal length, 34 (in orinoci, 29); greatest breadth, 19 

 (17); nasals, 16x6.5 (14.5x5); m I -m3, 6.3 (5.8). 



Doubtless the difference in size between the types of dor- 

 salis and orinoci is somewhat due to difference in the age of 

 the specimens, but the important color differences can hardly 

 be owing to the same cause, since two young specimens from 

 Suapure (March and December) are as dark on the back as 

 the adults. 



Oryzomys klagesi, sp. nov. 



Type, No. 16966, $ (?), El Llagual, Venezuela, Feb. 19, 1901; coll. 

 S. M. Klages, for whom the species is named. 



Pelage full and long. General color above ochraceous rufous slightly 

 varied with black-tipped hairs on the back, darker and less ochraceous 

 on the facial portion of the head ; decidedly dusky around the eyes 

 and over front of nose ; sides deep, uniform ochraceous from cheeks to 

 rump; below buffy white, the* basal portion of the fur gray; ears 

 small, light reddish brown, nearly naked ; upper surface of fore feet 

 buff, of hind feet pale yellowish gray; tail about equal to length of 

 head and body, pale brown, slightly paler below on the basal half, 

 nearly naked except on the apical fifth, where fine short hairs nearly 

 conceal the annulations and form a slight pencil at the tip. 



Skull rather short (especially the rostral portion), broad and very 

 flat, with an exceptionally broad and heavy supraorbital ledge, con- 

 tinued posteriorly to the interparietal as a strongly developed parietal 



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