1896.] NATURAL SCIENCES OF PHILADELPHIA. 529 



No. 3,872 $ , Argasa, ....'. April 17, 1895. 



No. 3,873 ^, Airaola, March 14, 1895. 



No. 3,877 Juv. Finik, December 14, 1894. 



No. 3,878 9 , Finik, December 14, 1894. 



29. Acomys sp.? 



A male specimen, (No. 3,862), the only one of this genus from 

 Sheikh Husein, is lighter colored than any of the foregoing listed 

 under spinosisshnus, and the tail is not longer than the body. The 

 ears are much larger than in any Acomys I have examined. The 

 skull differs in the great width of the audital bullae and the abrupt 

 compression of the jugal at its squamosal insertion. 



The total length of this mouse is 150 mm. ; the tail, 60 ; the hind 

 foot, 16.5; the ear from crown, 11. 



30. Acomys wilsoni Thos. Short-tailed Spiny Mouse. 



A spirit specimen of an old male, (No. 3,861), corresponds so ex- 

 actly with Oldfield Thomas's description'^ of ivilsoni as to leave no 

 doubt of its identity. The tail is only 47 mm. long ; the body, 182 ; 

 the hind foot, 13. The skull is 24.5 mm. long by 11.2 in breadth. 

 The corouoid process is well developed as compared with the other 

 Acomys in the collection. 



This specimen was taken at Burga Camp, Amara. 



31 Steatoniys parvus sp. nov. Lesser Fat Mouse. 



Type, No. 3,879, ad. 9 ; collection of the Academy of Natural 

 Sciences of Philadelphia. Collected by Dr. A. Donaldson Smith, 

 July 14, 1895, at Rusia, Lake Rudolf, Africa. 



Description — Size small, tail short and slender, less than one-third 

 the length of head and body. Colors similar to Steatomys pratensis 

 Peters {^^S. edulis Ptrs.). 



Above, uniform tawny brown, lined with black, slightly darker 

 on back and hind head ; sides more tawny. Underparts, including 

 feet, uniform soiled white. Upper and lower tail, colored like cor- 

 responding parts of body. A white spot at base of ear. 



Measurements — Total length, 107 mm.; tail vertebrae, 33 ; hind 

 foot, 13 ; ear, from crown, 8. 



Skull — Total length, 20 mm; basilar length (of Hensel) 17; 

 greatest breadth, 11 ; interorbital constriction, 3.4 ; length of nasals, 

 7.8; length of upper molar series, 3.2; length of mandible, 11.3; 

 breadth of mandible, 6.6. 



>5 Ann. Mag. N. Hist., 1892, p. 22. 



