NO. 17 NEW SPECIES OF EAST AERICAN RODENTS — HELLER 7 



snout and posterior rump more fulvous; sides pure fulvous, fairly 

 well defined against the dark dorsal area and the white of the under 

 parts ; limbs fulvous like the sides. Ears blackish, covered spar- 

 ingly by minute grayish hairs. A conspicuous white subaural patch. 

 Feet and under parts white, the hair white to the base. Tail hair 

 brown above, whitish below, closely covered by short stiff hairs 

 which hide the annuli. 



Measurements. — Head and body, 68 mm.; tail, 36; foot, 13. 

 Skull : greatest length, 20.5 ; condylo-incisive length, 19 ; zygomatic 

 breadth, 10; palatal length, 11; nasals, 8; length of upper molar 

 series, 3.3 ; palatine foramina, 5. 



This is a larger race of the tenellus group of the Lower Sudan, 

 of which it is the extreme in size. From suahelica of the Kiliman- 

 jaro region this species differs widely in its much larger size and 

 lighter coloration. The tenellus group is well defined by its long 

 snout, projecting incisors, and short hairy tail. Three other speci- 

 mens are in the collection from the type locality. 



MUS GRATUS SUNGAR^, new subspecies 



Kenia Pygmy Mouse 



Type from West Kenia Forest Station, altitude 7,500 feet; old 

 male, number 163487, U. S. Nat. Mus. ; collected by J. Alden Lor- 

 ing, September 20, 1909; original number, 7425. 



Characters. — Like gratus, but larger and lighter colored, with 

 the central dark area better defined. 



Coloration. — Median dorsal area from snout to base of tail mixed 

 blackish and tawny in about equal parts ; sides lighter, purer tawny, 

 changing somewhat abruptly from the dark dorsal region ; bounded 

 on lower sides where the sides meet the white of the under parts by 

 a fulvous line. Ears hair brown. Tail dark brown above, light 

 brown below. Under parts and feet white, the hair white to the 

 roots. 



Measurements. — Head and body, 70 mm.; tail, 60; hind foot, 

 14.5. Skull: occipito-nasal (greatest) length, 19.5 ; condylo-incisive 

 length, 18.2; basilar length, 15.5; zygomatic breadth, 10; length of 

 nasals, 7.2 ; length of palatal foramina, 4.9 ; length of upper tooth- 

 row, 3.5. 



The material of this form in the collection is quite extensive. 

 From the type locality there are six specimens, ten from Nyeri, 

 seven from Waubugus, and eight from Naivasha. There is con- 



