igii.] F. H. Stewart -. Cyprinidae frbm Tibet. jy 



(3) as pointed out by Herzenstein, the anterior end of the 



mouth cleft is on a level with the lower edge of the 

 orbit, whereas in 5. stoliczkae it is altogether below 

 the level of the orbit. This is due to the fact that 

 in 5. sever zovi : — 



(4) the eye is larger, its diameter in sexually mature adults 



being one-fourth, or nearly one-fourth, the length 

 of the head; whereas in sexually mature adults of 

 5. stoliczkae its diameter is only one-fifth to one-sixth 

 the length of the head. 



The six adults here separated as 5. severzovi all came from a 

 small ice-cold streamlet which seems to have only a periodic con- 

 nexion with larger waters, so that, after all, they may be only 

 dwarfs of 5. stoliczkae." 



For the purpose of this enquiry the various specimens have 

 been arranged in a series of groups. It will be well first to give 

 a summary of these groups and then to discuss the various charac- 

 ters given as separating the two species. 



P. I. The specimens of 5. severzovi from the Pamirs des- 

 cribed by Herzenstein. (For detailed measurements 

 of the individuals see Herzenstein, 4, p. 199.) 



P. 2. The specimens of S, stoliczkae from the Pamirs des- 

 cribed by Herzenstein. {Ibid., p. 195. Nos. 8734— 

 8812.) 



P. 3. Stoliczka's collection of 5. stoliczkae from the Pamirs 

 and Ladakh in the Indian Museum. 



P. 4. Alcock's six specimens of 5. severzovi from the Little 

 Pamir (Ind. Mus. Nos. 14141—14146) : vide pi. iii, 

 fig. 2. 



Ch. Four specimens from the Chumbi valley (Ind. Mus. 

 Nos. ^_^^ and '^) : vide pi. iii, fig. i. 



D. I. Four specimens from Guru with head characters of 



S. stoliczkae (Ind. Mus. Nos. ?^, -'^, !|i and ■^'). 



D. 2. One specimen from Guru intermediate as regards 

 head characters (Ind. Mus. No. m). 



K. I. Five specimens from Kang-ma with head characters 

 of 5. stoliczkae (Ind. Mus. Nos. ?^_!8£i): vide pi. iii, 



fig- 3- 

 K. 2. Eleven small specimens from Kang-ma (Ind. Mus. 



J,q-Qg 2S64— 2868 2909—2911 294(?— 29i8\ 

 1 ' 1 ^ 1 



G. I. Four small specimens from the Nyang-chu at Gyan- 



tse. 

 G. 2. Five small specimens from marsh pools near Gyantse. 



