358 



REPORT ON FISHES. PART II: SISORIDAE AND CYPRINIDAE 



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20 



Figure 19. Ptychobarhus coniroslris Steindachner. Lateral views of anterior portion of body of a male 

 specimen, 250 mm. long, from Spitok, Indian Tibet, and a female specimeti, 262 mm. long, from Kargil, Indian 

 Tibet, showing sc.xnal differences in structure of upper lip and curvature of snout. X H- 



Figure 20. Air-bladder of a female specimen of Ptychobarhus coniroslris Steind., 262 mm. long, from 

 Kari;il, Indian Tibet. X fi- 



the iipi)er lip L;rcatly l>r(ia(lciied anil thickened and the pnifilc of the snout is conspicuously 

 concave." Similar secondary sexual characters are al.so to he found in the female specimens 

 of the species hrought back by the Yale North India I'^xpedition (Text-figure 19, a, b). 



Bionomics: The peritoneum is black. The air-bladder is more or less similar to that 

 of Diptychiis viacidalits. Its ]iosterior chamber is greatly elongated and extends as far back 

 as the rectal end of the intestine. In a female specimen. 26J mm. long, excluding the caudal 

 fin, the length of the anterior chamber of the air-bladder is 25 mm. and that of the posterior 

 chamber 88 mm. (Text-figure 20). The alimentary canal is much convoluted: its length 

 in grown-up specimens is 1.2 to 1.5 times the length of the body including the caudal fin. 

 In the gut contents lumps of slime and algae mixed with mud and sand, as also large 

 ninnbers of Chirononiid larvae were found. It appi'ars probalile that /', Cdniroslris is a 

 mixed feeder. 



Lhstribiition: I', cdiiirdslris has so far been rejiorted from the headwaters ni the Indus 

 and the western border of Tibet. 



Rriiiarks: Herg'"' regards Ptycliobdrhiis as a subgenus of nifitxrlnis and gives the 

 following synopsis for the separation of the various subgenera: 



""Berg, L. S.: Fainic tic hi Russic, Poissoiis, III. p. 6/7 (1914). 



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