16 BULLETIN 99, UNITED STATES NATIONAL MUSEUM. 



tainly the youngish specimens from all localities are the extreme of 

 the ochraceous phase; the older specimens with well-worn teeth are 

 grayer with lighter underparts; and the only two aged specimens, 

 with the teeth excessively worn, are distinctly grayish rather than 

 ochraceous in color, with gray tails and very pale buffy ochraceous 

 bellies. These last two specimens are the only nursing females in the 

 entire series. The Taita HiUs specimens are all considerably older, 

 with more worn molars, than the specimens from Taveta or Chan- 

 gamwe, and the very slightly lighter coloration may be explained in 

 this way or even by a slight difference in pelage. At any rate, the 

 difference is so little that it is hardly worth considering. 



Doctor Abbott collected this squirrel up to 5,000 feet on Kihman 

 jaro. A female collected by Heller at Ndi, November ?>, contained 

 two embryos and one collected at Maji-ya-chumvi, December 13, the 

 same number. Meams records the color of the iris as dark brown. 



Through the kindness of Dr. Witmer Stone I have been able to 

 examine during work on this group the type of Sciur^is ganana 

 Rhoads,* from the Ganana River, between British East Africa and 

 Italian Somaliland. The type differs from all specimens of the 

 Paraxerus ochraceus group in the collection by its much yellower 

 coloration, but is obviously closest to aruscensis, of which general 

 style it is the extreme. The specimen is an adult nursing female. 

 The upper parts and sides are much more yellowish than in any speci- 

 men of aruscensis, the limbs being almost clear yellowish buff. It 

 is slightly smaller than aruscensis, with a more slender skull. The 

 two forms almost certainly intergrade in eastern British East Africa. 

 Measurements of the type of Paraxerus ochraceus ganana are given 

 for comparison with other forms in the table on page 19. 



PARAXERUS OCHRACEUS JACKSONI (de Winton). 



1897. Scinrvs jaclsoni de Winton, Ann. and Mag. Nat. Hist., ser. 6. vol. 19, 



p. 574. May. (Kikuyu, British East Africa; type in British Museum.) 

 1^09. Paraxerus jaclsoni capitis Thomas, Ann. and Mag. Xat. Hist., ser. 8, vol. 



4, p. 105. August. (Nairobi Forest, British East Africa; tj-pe in 



British Museum.) 

 1910. Paraxerus jacksoni and Paraxinis jacksoni capitis Roosevelt, African Game 



Trails, Amer. ed., pp. 472 and 476; London ?.d., pp. 484 and 488. 

 1914. Paraxerus jacksoni rocKERELL. Miller, and Printz, Zool. Anz., vol. 44, 



p. 4;i5. .Tune 23. 



Specimens. — Fourteen, from localities as follows: 



British East Africa: Nairobi, 10 (Mearns, Loring); Nyeri, 3 

 (Heller, Mearns) ; Wambugu, 1 (Loring). 



Mearns notes the mammae, on females from Nairobi and Nyeri, as 

 three pairs. The Nyeri specimens are approaching somewhat the 

 Guaso Nyiro form, Paraxerus ochraceus Icaliari, which is slightly 

 darker in color. 



1 Proc. Acad. Nat. Sci., Phila., 1896, p. 522. 



