43 8 bulletin American Museum of Natural History. [Vol. XX, 



very much difference in size or proportions, as shown by 

 the following measurements of 38 adults (the females all 

 show marks of having suckled young) from the Santa Marta 

 district. 



Total length. Tail vert. Hind foot. 



Bonda and Onaca, 7 spec. $ 280(254-302)122 (113-130)34 (30-38) 



"3 ? 283(264-298)118 (111-127)32.3(30-35) 



Masinga Vieja, 7 $ 33( 2 75-3 2 ) I2 7 (122-145) 35 (33~37) 



4 $ 294(270-305) 127.5(123-130) 34.7(33-3 6 ) 



Minca, 8 6 276(260-303) 122 (113-132) 31 (29-35) 



9 " ? 265(254-291) 116 (103-120) 31.5(29-35) 



S.boruccz, Type $ 275 115 32 



S.bogotensis* 8 spec. 275 100 33 



The pelage in 5. boruca is much softer and less hispid than 

 in the Santa Marta form, and the general color is less ferrugi- 

 nous. These features are much more strongly evident in 

 the young in first pelage than in the adults, the contrast in 

 color between the young examples in the two series being 

 very marked ; the young of S. borucce are rusty brown while 

 the others are much darker, having only a slight fulvous wash 

 in place of the strong rusty wash in S. borucce. The ear is also 

 very much larger in the Santa Marta form than in 5. bornca, 

 and less heavily clothed. 



[Since the manuscript of this paper was sent to the printer Mr. 

 Outram Bangs, Curator of Mammals at the Museum of Comparative 

 Zoology, Cambridge, Mass., has generously sent me, in response to 

 my request for certain specimens, nearly all of the Santa Marta Muridae 

 (only the genera Sigmodon and Mus being omitted) collected by Mr. 

 W. W. Brown for collation with the Muridae of the Smith collection, 

 with the request that I should 'describe any species that might prove 

 new. It is needless to say that such courtesy is greatly appreciated; 

 and the following is submitted as a supplement to the foregoing enum- 

 eration of the Muridae of the Smith collection. 



Of the 9 species of indigenous Muridae recorded by Mr. Bangs as 

 collected by Mr. Brown, 5 are represented in the Smith collection, the 

 other 4 being apparently not found in the region explored by Mr. 

 Smith's collectors. On the other hand the Smith collection contains 

 4 not obtained by Mr. Brown, making a total of 13 species of Muridae 

 thus far recognized from the Santa Marta region. The following is a 

 collation of the two collections. 



1 Measurements approximate, from skins. 



