94 CATALOGUE OF UNGULATES 



forming more than a complete 

 circle; length from 59 to 62 in., 



girth 18 to 20 in. No ruff* 0. a. ammon. 



b'. Horns less everted, with first turn 

 nearly vertical, forming about a 

 circle, and front outer angle often 

 distinct ; length from 48 to 57 in., 

 girth 17 to 19 in. A ruff at all 



seasons* 0. a. hodgsoni. 



c'. Closely allied to last, but with front 

 outer angle of horns rounded off. 

 Known horns ranging from 41 to 

 50 in. in length, with a girth of 



from 16 to 18 in 0. a. mongolica. 



d'. Horns smaller; length from about 45g 



to 47 in., girth 14 to 15 in 0. a. sairensis. 



b. Horns slighter and forming a more open 

 curve, frequently with outer front 

 angle strongly pronounced. 

 a'. General colour in winter rufous, thighs 

 coloured like back, no distinct 

 rump-patch, tail yellowish above, 

 muzzle white; throat-ruff yel- 

 lowish. 

 Horns moderately extended; length 



55 to 58 in., girth 17 in 0. a. littledalei. 



b'. General colour in winter pale fawn, 

 thighs, rump-patch, tail, and ruff 

 white ; face light-coloured. 

 a". Horns of general type of little- 

 dalei, but apparently somewhat 



thicker ; rump-patch small 0. a. Jcarelini. 



b". Horns of same general type, but 

 with outer front angle fre- 

 quently rounded off; rump- 

 patch larger 0. a. humei. 



c". Horns slender and forming a more 

 open and extended spiral than 

 in any of the other races, with 

 front outer angle generally pro- 

 nounced ; length of fine speci- 

 mens 69 to 75 in., girth 14^ to 



16 in., or, rarely, 17 in 0. a. poli. 



B. Size smaller. 



a. General colour in winter dark brown, 



gradually shading into white of 

 under-parts, a white rump- patch 

 and muzzle, tail greyish brown 

 above, throat -ruff greyish white. 

 Horns of the littledalei type ; 

 length 35| to 38 in., girth 10 J in. 0. a. nigrimontana. 



b. Imperfectly known. Horns apparently 



more of the ammon form ; length 



in type 40 in., girth 11^ in 0. a. storcki. 



* Blanford, Proc. Zool. Soc. 1896, p. 787. 



