24 BUULETIN 99, UNITED STATES NATIONAL MUSEUM. 



This darker race of Xerus rutilus must be very mucli like the later 

 described Xerus dabagala dorsalis DoUman^ from Baringo. Mr, 

 Dollman has in fact referred specimens from the Tsavo River, virtu- 

 ally topotypes, to his form.^ Neumann's specimens were young, 

 which perhaps accounts for his description of the hands and feet as 

 "deep rust-red;" the feet of younger specimens of groimd squirrels 

 seem to be darker than those of adults. The color is still more likely 

 to have been due to soil stain, as the Taveta specimen collected by 

 Doctor Abbott has the feet deeply stained by red soil, the pigment 

 being plainly visible with the aid of a lens. 



Genus EUXERUS Thomas. 



1909. Euxerus Thomas, Ann. and Mag. Nat. Hist., ser. 8, vol. 3, p. 473. June. 



(E. erythopus.) 



No East African forms have been named in this genus since Mr. 

 Thomas published his key and synopsis of the group (as a subdi- 

 vision of Xerus) in 1905.^ 



For measurements of specimens of squirrels of this genus see page 23. 



EUXERUS ERYTHOPUS LEUCOUMBKINUS (Ruppell). 



[1835]. Sciurus leiicoumhrinus Ruppell, Neue Wirbelth. Fauna Abyssinien 

 geliorig, Saug., p. 38. 1835-1840. (Abyssinia, Sennaar, and Kordofan.) 



Specimens. — Two, as follows: 



Eritrea: Agordat (from W. F. H. Rosenberg). 



EUXERUS LACUSTRIS (Thomas). 



1905. Xerus ery thro pus lacustris Thomas, Ann. and Mag. Nat. Hist., ser. 7, vol. 

 15, p. 388. April. (Masindi, Unyoro, Uganda; type in British Museum.) 



Specimen. ^-One, from — 



British East Africa: Kaimosi (Turner). 



No specimens of typical Euxerus lacustris are available for a direct 

 comparison, but the Kavirondo specimen agrees so well with Mr. 

 Thomas's description that I have no hesitation in labeling it lacustris. 

 I believe the form to go rather with microdon than with erytliopus, as 

 the teeth most resemble the East African form. All the races will 

 probably prove to be subspecies of erytliopus. 



EUXERUS MICRODON (Thomas). 



1905. Xerus microdon Thomas, Ann. and Mag. Nat. Hist., ser. 7, vol. 15, p. 389. 



April. (Kitui, British East Africa; type in British Museum.) 

 1905. Xerus microdon fulvior Thomas, Ann. and Mag. Nat. Hist., ser. 7, vol. 



15, p. 389. April. (Fort Hall, British East Africa; type in British 



Museum.) 



1910. Euxerus microdon fulvior Roosevelt, African Game Trails, Amer. ed., 



p. 472; London ed., p. 484. 



' Ann. and Mag. Nat. Hist., ser. 8, vol. 7, p. 519. May, 1911. 



s Revue Zool. Africaine, vol. 4, p. 89. July, 1914. 



» Ann. and Mag. Nat. Hist., ser. 7, vol. 15, pp. 387-390. April, 1905. 



