4 SMITHSONIAN' MISCELLANEOUS COLLECTIONS VOL. 54 



pure silky white, the hairs wliite to the roots. Tail dark brownish 

 above, buffy below ; covered with short hairs. 



Mcasurcincnts. — Head and body, 83; tail, 46.5; hind foot, 16.5; 

 ear, 11.5. Skull: condylobasal length, 22.2; basilar length, 19; zygo- 

 matic breadth, 12.5; nasal, 9.7; interorbital constriction, 4.5; dia- 

 stema, 6.3; mandible, 13.2; maxillary toothrow, 4.4. 



This species differs from S. pratciisis of South Africa and Mozam- 

 bique in its much lighter dorsal coloration, which shows no tendency 

 toward rufous, and in its larger size. 



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