SCIENTIFIC RESVLTS FROM THE MAMMAL SURVEY. 937 



respects larger than A. indica, of which Col. Hotson has also 

 sent specimens, while it is smaller, though with larger ears, than 

 any of the larger species of the genus. 



As being the most striking of the new species he has been 

 instrumental in discovering in Baluchistan, I have named this 

 interesting Jerboa in honour of Col. Hotson, the donor of the 

 fine collection in which it occurs. 



OCHOTONA RUFESCENS VULTURNA, subsp. nOV. 



Size rather less than in typical rufescens, greater than in the 

 Central Persian 0. r. vrder. General colour in full summer 

 pelage much more uniformly buffy reddish than in the other forms, 

 the light neck band less contrasted with the back, owing to the 

 paler colour of the latter. Forehead and crown buffy cinnamon, 

 the subterminal band of the hairs warm buff, their ends strong 

 cinnamon; band across neck dull buff"y ; back like crown, not, as 

 in the other forms, with a more reddish shoulder band and greyer 

 hind back, but nearly uniform mixed buffy and cinnamon. Under- 

 surface slaty greyish broadly washed with buffy. Ears like the 

 head. Limbs pale buffy throughout. 



Skull with larger bullae than in vizier, rather smaller than in 

 regina, and larger than in a Kurum Valley specimen of true 



rufescens, 



Bimensionsofthe type: — Head and body, 167; hindfoot. 32; ear, 

 23. Skull: uppei length, 42 mm. (Skull of the more fully adult 

 No. 126, the nasal sutures commencing to anchylose : — upper 

 length, 44; condylo-incisive length, 41-5; zygomatic breadth, 

 22-7; nasals, 14-2; interorbital breadth, 4-3; parietal breadth, 

 17-2; greatest bimeatal breadth. 21-5; palatal foramina, 12-3; 

 breadth of palatal bridge, 2-2; bullae horizontal antero-posterior 

 length, 12-2; oblique diameter on side aspect (upper anterior to 

 lower posterior edge), 11. 



Hah : — Kelat region, Baluchistan. Type from Harboi, near 

 Kela.t. 



Type :— Young adult s ■ B. M. No. 19. 11. 8. 57. Original number 

 103, Collected 11th August 1917, and presented by Col. Hotson. 

 Two specimens. 



The Pikas referable to 0. rufescens are found over a large quadri- 

 lateral corresponding approximately with the northern half 

 of Persia and the whole of Afghanistan, At the north-western 

 corner of this quadrilateral, on the Kopet Dagh, Ashabad and 

 Meshed, there occurs 0. r. regina, then at the north-eastern corner, 

 at Kabul and in the Kurum Valley, typical 0. rufescens ; at the 



