10 MR. O. THOMAS ON MAMMALS FROM [Jan. 17, 



is apparently, as already remarked, more nearly allied to S. congicus. 

 Prof. Leche's six specimens are stated to be all immature, a state- 

 ment that perhaps only rests on their inferior size as compared with 

 S. lemniscatus, S. boehmi being decidedly smaller than that species. 

 Indeed the beautiful .figure given by Prof. Leche represents, when 

 increased to scale, an animal quite as large as the largest of our 

 specimens of S. boehmi, all of which are undoubtedly fully adult. 



Notes on the habits of this species have been made both by 

 Dr. Bcihm (Noack, t. c. p. 251) and Dr. Emin himself (Leche, I. c). 



22. Xerus erythropus, Geoffr. 



a. S. Tingasi, 16/10/83. 



b. d- Stat. Gadda, 4/2/81. 



c. Skeleton. Stat. Gadda. 



d. Skull. Foda, Lake Albert Nyanza, 12/85. 



" Iride fusca. Monbuttu name ' Koro.' Common everywhere." — ■ 

 E. 



No difference that could be ascribed to season is observable 

 between a and b, collected respectively in October and February. 



23. Gerbillus, sp. (allied to G, leucogaster, Peters). 



a. ? . Tingasi, 31/8/83. 

 h. 2 . Stat. Gadda, 24/1/84. 

 " Monbuttu names ' Kota' and ' Sinsi.' "— E. 



24. Gerbillus, sp. 

 a,b. Wadelai. 5/86. 



In the state of confusion in which the species of Gerbilles are at 

 present it is impossible to determine these specimens with certainty, 

 but they are nevertheless of the utmost value as supplying material 

 for a future revision of the group. 



25. Cricetomys gambianus, Waterh. 



a,b. c? & ?. Beliima, Monbuttu, 16/7/83. 

 c, d. Tingasi, 8/83. 



e. Skeleton ? . Tingasi, 7/9/83. 

 f-i. c? & 2 . Stat. Gadda, 2/84. 



}'. Skeleton 6 . Stat. Gadda, 14/3/84. 



k. Skull, c? . Kubbi, Monbuttu, 7/83. 



I. Skull, 2 . Foda, Lake Albert Nyanza, 12/85. 



" Iride fusca. Native name ' Assumba.' " — E. 



Specimens a and b, from Beliima, differ from the rest by their 

 greyer colour, grey instead of pure white bellies, and the less sleek 

 character of their fur, differences which, as shown by the fine series 

 obtained, are neither seasonal nor sexual. Their skulls, however, do 

 not present any valid specific distinction, and it is probable that we 

 have here one of the definite but non-specific variations often known 

 to be due to some difference in the nature of the locality — as, for 

 example, a difference either in altitude, presence or absence of forest, 

 or amount of rainfall. 



