538 PROCEEDINGS OF THE ACADEMY OF [1896. 



Measurements — Total length, 234 mm. ; tail vertebrse, 135 ; hind 

 foot, 26.5; ear, from crown, 10. 



Skull — Total length, 30.6 mm. ; basilar length, 25 ; greatest 

 width, 16; interorbital constriction, 6; length of nasals, 12; length 

 length of upper molar series, 4; length of mandible, 16; width of 

 mandible, 7.8. 



An old adult male, in spirit, which I have made the type, two 

 immature specimens, male and female (Nos. 3,926, 3,925) also in 

 spirit, and another immature specimen, a skin with skull (No. 3,856) 

 fully represent a species which was collected on the route to and 

 from Lake Rudolf between June 2d and August 5, 1895. The more 

 pallid pelage of the dry skin would indicate it either to be a desert 

 race of the type or that the specimens in alcohol of same age have 

 become darkened by their immersion. In either case the species is 

 lighter colored than any other in the collection. I have ventured 

 its sepai'ation because of the remarkable and apparently unique 

 character of the hairy- soled feet. This is quite as marked in the old 

 as in the young. These sole hairs form a sort of cusliion on and 

 just behind the anterior tuberculated part of the bind and fore feet, 

 and even the plantar excrescence of the heel is furnished with scat- 

 tering bristling hairs. The toes are almost as fully haired beneath 

 as above. The character of the tuberculation of i^i- Jj as above 

 given, is also strongly diagnostic. 



48. Gerbillus ruberrimus sp. moy. Little Red Gerbillus. 



Type, No. 3,927, ad. $ ; collection of the Academy of Natural Sci- 

 ences of Philadelphia. Collected by Dr. A. Donaldson Smith at 

 Finik near Webi Shebeli, Somaliland, Africa, December 14, 1894. 



Description — Size smallest (?) of the African species of the genus. 

 Tail nearly IJ times the length of head and body; color above bril- 

 liant red-brown to orange-yellow. Ears relatively very small and 

 round. 



Color (of type) above, clear rich reddish-cinnamon with slight 

 admixture of black tipped hairs. Sides scarcely paler, a strong line 

 of demarkation between red of upper and white of lower parts. Base 

 of ear, patch over eye, upper lips, feet and under parts pure white; 

 ears well haired and colored like upper head. Tail unicolor, red- 

 dish-fawn throughout, becoming blackish on the distal, penicillate 

 hairs and terminal tuft. 



Skull — Basi-occipital and audital bullre but slightly separated ; 

 •ncisive foramina not reaching the anterior plane of molar series. 



