190 Bangs J. New Sigmodon from Colombia. 



haired on outside; skull with wide nasals and large, wide, incisive foramina 

 (teeth too worn to show characters well), otherwise not differing much 

 from the skull of the type species, S. hispidus. 



Color. Upper parts dull tawny-ochraceous, becoming darker and more 

 russet on rump, and lined with blackish tipped hairs, which are most 

 numerous along back ; hairs plumbeous at base, except a few sprinkled 

 over back and sides, which are yellowish-white throughout their entire 

 length ; * nose and cheeks wood brown ; under parts dull wood brown to 

 whitish, the plumbeous under fur showing through ; upper surface of feet 

 and hands dark gray; tail very hairy, dusky above, dull grayish below. 



Measurements. Type, total length, 282 ; tail vertebrae, 1 1 5 ; hind foot, 

 32 ; ear from notch, 20. No. 8250, $ adult, from Palomina : total length, 

 290; tail vertebrae, 120; hind foot, 30; ear from notch, 17. 



Skull, type, basal length, 32; occipitonasal length, 36.4 ; zygomatic 

 width, 19.2; mastoid width, 14; interorbital width, 5.6; length of nasals, 

 13.2; breadth of nasals, 4.2. 



*This character is shown equally by both specimens, and gives a pecu 

 liar grayish cast to the fur. 



