NO. 17 NEW SPECIES OE EAST AFRICAN RODENTS — HELLER 5 



Nile species. This new form approaches ochropus of British East 

 Africa closer than any other equatorial species. From this species 

 it is readily separable by the white under parts and the bicolored 

 tail, and also by slightly smaller skull and feet. 



Two other specimens, both with stripe obsolete, are in the collec- 

 tion from Hoima and Gondokoro, Uganda. 



MUS MUSCULOIDES EMESI, new subspecies 



Uganda Pygmy Mouse 



Type from Kabula Muliro, Uganda ; adult male, number 164819, 

 U. S. Nat. Mus. ; collected by J. Alden Loring, December 27, 1909; 

 original number, 8497. 



Characters. — Dorsal coloration similar to murillus; hair of under 

 parts white to the roots ; body size less, with proportionately smaller 

 skull. 



Coloration. — Median dorsal area blackish, sparingly flecked with 

 tawny; sides hghter and more tawny, the lower sides well defined 

 against the white of the under parts by a narrow band of fulvous ; 

 dorsal pelage composed of black hairs annulated with tawny and of 

 scattered wholly black hairs. Limbs like sides, ears and dorsal sur- 

 face of tail blackish and clothed by minute hairs. Feet and under 

 parts white, the hair white to the roots. Lower side of tail whitish. 



Measurements. — Head and body, 71 mm.; tail, 51; foot, 13.5. 

 Skull: greatest length, 20.1; condylo- incisive length, 18.5; nasal, 

 7.9; zygomatic breadth, 10.5; palatal foramina, 4.4; upper molar 

 series, 3.5. 



Skull similar to miirillus and to the members of the musculoides 

 group generally, having the masseter knob and anterior cusp of 

 m^ little pronounced. This is a small white-bellied Nile race of the 

 widespread musculoides group. 



The series of nine topotypes shows considerable variation in dor- 

 sal coloration, ranging from the dark color of the type to a rufous 

 phase. A specimen taken at Hoima, Uganda, is also referable to 

 this new form. 



MUS WAM.ffi, new species 



Long-snouted Pygmy Mouse 



Type from Kapiti Plains, British East Africa; adult female, 

 number 161777, U. S. Nat. Mus.; collected by J. Alden Loring, 

 May 6, 1909; original number, 6061. 



