572 Mr. O. Thomas on 



from the actual type-locality o£ saltator, must, I think, be 

 synonymous with it. Like that animal, it is distinctly 

 smaller than A. rilchheih'. 



I have connected Mr. RUckbeil's name with this jerboa in 

 recognition of the pains he has taken in making this interesting 

 collection of Djarkent mammals. 



Eleven. 



30. Allactaga elater, Licht. 



31. Lepus sp. 



Three. 



Probably L, hhmanni, Sev. 



32. Ochotona sacana, sp. n. 



Seven from Przewalsk. 



Like 0. macrolis, but warmer coloured, especially on the 

 flanks. 



Size and all essential characters as in 0. macrotis. General 

 colour above in winter pelage buffy brown of a considerably 

 warmer and stronger tone than the whitish buffy of the 

 winter pelage of macrotis. On the sides and rump, instead 

 of getting whiter, the ends of the hairs become more rufous, 

 so that the flanks are distinctly cinnamon, the basal two- 

 thirds of the hairs being, however, still dark plumbeous and 

 a subapical band white. Under surface dull whitish, faintly 

 washed with cinnamon. Centre of face pale cinnamon. 

 Ears large, blackish brown on proectote, greyish white ou 

 metentote. Hands and feet buffy white above; palms and 

 soles greyish. 



Skull as in 0. macrotis. Frontal vacuities present in all 

 the specimens. 



Dimensions of the type (measured on skin) : — 



Head and body (c.) 200 mm. ; hind foot 33 ; ear 28. 



Skull : greatest length 47 ; condylo-incisive length 44 ; 

 zvgomatic breadth 22"5 ; nasals 16 x 5"5 ; interorbital breadth 

 5-3 ; breadth of brain-case above meatus 18 ; palatal foramina 

 13-5 X 4*7 ; breadth of palatal bridge 1-8 ; upper tooth-series 

 (alveoli) 9. 



Hah. Przewalsk. 



Type. Adult male. P.M. no. 14. 5. 10. 219. Original 

 number 442. Collected 15th December, 1913. 



While undoubtedly nearly allied to 0. macrotis, this pika 



