﻿NO. l6 NEW RODENTS FROM AFRICA HELLER 5 



condylo-incisive length of mandible, 40; coronoid-angular depth 

 of mandible, 17. 



Three specimens are in the collection from the type locality. 

 They agree minutely in coloration and size. I take pleasure in 

 naming this new race for Mr. Oldfield Thomas, to whose investi- 

 gations are due the discovery and description of the great bulk of 

 East African mammals. 



OTOMYS ORESTES DOLLMANI, new subspecies 



Uaragess Veldt Rat 



Type from Mt. Gargues (Uaragess), Mathews Range, British 

 East Africa, altitude, 7000 feet; adult male, number 181790, U. S. 

 Nat. Mus. ; collected by Edmund Heller, August 27, 191 1 ; original 

 number, 4125. 



Characters. — Closely allied to orestes, and having six laminae to 

 last upper molar, but skull narrower at interorbital region, which 

 is less beaded and arched, with markedly smaller bullae; coloration 

 dark olive like tropicalis. 



Coloration. — Dorsal color uniform bister, the sides lighter Van- 

 dyke brown; ears black; feet dark gray; underparts grayish, with 

 raw umber suffusion, the hair basally plumbeous. 



Measurements. — Head and body, 150 mm. ; tail, 88; hind foot, 25 ; 

 ear, 21. Skull: greatest length, 37.4; condylo-incisive length, 34; 

 basilar length, 29.2; zygomatic breadth, 18. 1 ; interorbital constric- 

 tion, 4.9; nasals, 17.2 x 7; diastema, 8.5; post palatal length, 12; 

 palatal foramina, 6.6; maxillary toothrow, 8.1 (alveolar) 7 

 (crowns) ; condylo-incisive length of mandible, 12.3 ; coronoid- 

 angular depth of mandible, 13.2. 



Five specimens were secured in the forests glades at the extreme 

 summit of Mt. Uaragess. These all agree in laminal formulae with 

 the type. Named for Mr. Guy Dollman, who has studied exten- 

 sively the collections of East African mammals at the British 

 Museum. 



DENDROMUS MESOMELAS PERCIVALI, new subspecies 



Uaragess Tree Mouse 

 Type from Mt. Gargues (Uaragess), Mathews Range, British 

 East Africa, altitude, 7000 feet; adult female, number 181791, U. S. 

 Nat. Mus.; collected by A. Blayney Percival, August 26, 191 1; 

 Heller number, 4100. 



