911.] 



F. H. vStewart : Cyprinidae from Tibet. 



91 



Colour in spirit. — Silvery with yellowish brown underlying 

 colour on back of head and body. 



Following Herzenstein's key (4) — 



The dorsal spine : the upper half is segmented, the lower half 

 bears well-developed teeth. The anterior end of the mouth-cleft 

 lies slightly above the lower margin of the orbit. The gill-rakers 

 on the first pharyngeal bar number, outer row 11, inner row 15. 

 Among the species described by Herzenstein it appears to approach 

 most closely to G. mactdatus, Herz. It is separated from the 

 latter by the differences in the fin formulae, by the absence of 

 ' ' humping ' ' in front of the dorsal fin, by the smaller numbers of 

 the pharyngeal teeth, by the forward position of the dorsal fin and 

 by the colour. No grey coloration of back ; no spots. 



It differs from the young of G. waddellii in the following 

 points : An. ii. 5 (not ii. 6); V. i. 18 (not i. 9). Does not slope so 

 rapidly from the commencement of the dorsal fin, thus the 

 maximum bod}' height is to the post-dorsal as 1*10 to i (not 1*35 

 to i). Maximum body height to the minimum is as 2*30 to i (not 

 2-87 to i). The predorsal body height is to the postdorsal as i to 

 r'23 (not I to 1T4). The length of the first dorsal spine to that 

 of the second is as i to 2 (not as i: i^). The numbers of the 

 pharyngeal teeth, the forward position of the dorsal fin, and the 

 difference of colour. 



The following table gives the measurements of two adult spe- 

 cimens of Gynuiocypris waddellii, Nos. ^ and ~ , of one young 

 specimen of this species, No. -;- , and of G. hohsonii, sp. nov. , 



No. '-^ 



Table V. 



Indian Museum Register No. 



Total length in millimetres 



Body length 



Body length: maximum body height 



Maximum body height : postdorsal 



Maximum body height : minimum 



Body length: length of tail from posterior 



of base of anal. 

 Length of tail: height of tail . . 

 Body length : head length 

 Head length : head breadth 

 Head length : head height 

 Breadth of mouth: length of mouth 

 Head length : diameter of eye . . 

 Interorbital : diameter of eye 

 Head length: postorbital head length 

 Body length : base of dorsal 

 Height of dorsal : base of dorsal 

 Maximum height of dorsal : aiinimum 

 Body length : pectoral fin length 

 Body length : ventral fin length . . 

 Body length : head breadth 

 Body length: head height at level of pos- 

 terior edge of opercle. 



417 



360 

 4-50 

 1-46 

 3-10 

 6-00 



2-50 



4-35 

 1-50 

 1-50 

 1-65 

 6 20 

 2-30 

 1-65 



8 -GO 

 I -20 

 2-30 

 6-30 



7"50 

 6-'5o 



475 



440 

 380 



5 "00 



25 



00 



50 



1 



125 

 lOI 



5-40 



I -35 



2-87 



5-50 



14s 

 122 



5-50 

 i-io 



2-30 



5 •CO 



