212 MR. J. LEWIS BOXIIOTE OX THE [iSTov. 15, 



then dirty white, with a subteriniual buff ring and dai'k brown 

 tip. The dark tips are absent on the hairs of the feet and in^der 

 parts, and absent or inconspiciious on a patch behind eitliei* ear, 

 which patches tend to meet across the nape. On the frontal 

 region the buff subterminal ring extends down to the grey base 

 and is moi-e rufescent. In summer the pelage is similar, but the 

 colour on the back and head tends to be more rufescent, and that 

 of the flanks and under parts a purer white. The white patches 

 behind the ears are larger, and have coalesced on the nape forming 

 a broad white collar, succeeded posteriorly by a rufescent collar 

 of about half its width, which gradually merges into the general 

 reddish colour of the remainder of the body. This rufescent 

 collar starts from two mai-oon patches situated on the under side 

 of the neck, and may thence be traced upwards and backwards, 

 becoming paler and more rufous in coloui-, to meet over the 

 shoulders in the middle line. The maroon patches form a dis- 

 tinctive feature of this species, but they are not always to he seen 

 in the winter pelage. 



The skull may best be described by comparing it with that of 

 0. ladacensis, from which it diffei-s in l^eing broadei- aci-oss the 

 muzzle. The bullae are more rounded and swollen, thereby nar- 

 rowing the basioccipital. The main difference, however, lies in 

 the incisive and palatal foramina, which are not, as in 0. ladac- 

 ensis, separated, but foi-m one large foramen slightly constricted 

 about one-third of the way from its anterior end. The portion 

 anterior to this constriction is of uniform width and narrow, the 

 posterior poi-tion gradually widening out throughout its length. 

 This distinction forms the difference between the two groups. 



Dimensions (a^jprox. from skin). Head and body 175 mm.; 

 hind foot 32 ; ear 22. 



Shdl. Greatest length 52 mm. ; basal length 42 ; zygomatic 

 breadth 24; length of nasals 16; length of molar series 10; 

 interorbital breadth 3. 



Habitat. The type came from Barbei-'s Tomb, Rocky Hills, neai- 

 Cabul ; but its range extends throughout Afghanistan, extending 

 into Persia and Ti*anscaspia. 



The white collar and maroon patches on the thi'oat foi-m 

 characters by which this species may readily be recognised, but 

 even apart from these it does not bear a very close resemblance to 

 ^ny of the species which have hitherto been described. 



OCHOTONA KOSLOWI (BUclm.). 



Lagomys koslowi Biichner, Mamm, Przewalski, i. p. 187 (1894). 



Size rather large. General colour of the upper parts, which is 

 uniform thi-oughout, pale whitish buff tinged with vinaceous. 

 Under parts and feet, which are thickly furred, white. Each 

 hair is gi^ey for about half its length at the base, the terminal 

 half being vinaceous buff fading to whitish or ending in a dark 

 brown tip, which last is never sufficiently conspicuous to modify 



