REPORT ON FISHES. PART II : SISORIDAE AND CYPRINIDAE 355 



1878. Diplyclnis iiuicitlatiis. Day, Sci. Res. 2nd Varkand Miss., Ichthyology, ]t. 10, pi. ii, fig. 3. 



1878. Viplyiliiis iiiaculahts, Day, Pish. India, p. 534, pi. cxxiv, fig. 3. 



1889. Diptyclius inaculatiis. Day, Faun. Brit. Ind., Fish., I, p. 255, fig. 92. 



1910. Diptychns maculatus, Zugmayer, Zoo!. Jahrb., Ahth. Syst., XXIX, p. 292. 



1914. Diptyclius inacuhitus. Berg, Faitnc de la Russie, Poissons, III, p. 677, figs. 133-135. 



1916. Diptyclius viaciilatus, Berg, Poissons des Eau.v Donees de la Russie, p. 286. 



1916. Diptyclius maculatus, Vinciguerra, Ann. Mus. Civ. Stor. Nat. Genova, XLVII, p. 145. 



1931. Diptychns maculatus. Berg, Zool. Anz., XCVI, p. 311. 



1932. Diptychns maculatus, Berg, Poiss. des Faux Donees de I'U. R. S. S. (3rd ed.), pt. i, 

 p. 466. 



1935. Diptyclius iiiaciilalus, TTora and Mukcrji, in Visscr's Karakoruin. I, p. 435. 



Dipl\clius maculatus is a very widely distributed species in Central Asia, usually inhab- 

 iting rocky, niuuntainiius streams. It exiiibits considerable variations in different body pro- 

 portions, nature of the barl)els, tiie diameter ui the eyes and tlie colouration. The Yale 

 North India Expedition obtained 16 specimens of the species in May-July, 1932, from the 

 following localities: 



A rapid stream at Nimu: Ladak (Sta. L 12) ; ca. 10,250 ft 4 (123 mm. ; 33-60 mm.) 



A torrential .stream at Lhabaps: Ladak (Sta. L31); ca. 11,855 ft 4 (108 mm. ; 27-32 mm.) 



A large rapid stream between Taiigtse and Mugleb: Ladak (Sta. L 37) ; ca. 13,700 ft. 



2 (118 mm.; 107 mm.) 



Stream at Chagra: Ladak (Sta. L46); ca. 15,215 ft 2 (270mm.; 225 mm.) 



Stream at Leh 5 (95-135 mm.) 



From the al)ove list of localities it will be seen that the majority of the specimens 

 collected by the Expedition are either young t)r half-grown and they all come from rapid 

 to toi-renlial streams. The two specimens taken at Chagra are large; the larger one l>eing 

 27U mm. in length excluding the caudal fin. 



Preeding: The breeding season of I>. inaculatus is not definitely known so far,''* but 

 from an examination of the nature of the gonads of a number of specimens brought back 

 by the Yale North India Expedition, it appears that the spawning of the species takes place, 

 like Schicopygopsis stoliczkac, during the months of May to August. Both the specimens 

 taken at C'hagra are gravid females. 



lHonoiiiics: The peritoneum is black. The air-bladder is more or less similar in struc- 

 ture to that of .Schi::opygopsis stoliczkac: (Text-figure 18). The alimentary canal is much 

 convoluted. In young and half-grown specimens its length is alxiut twice the length of 

 the body including the caudal fin, while in larger individuals it is more than twice. The 

 gut contents of a numlK'r of specimens under report indicate that the young immature stages 

 fi'ed on nyni]>bs and l;irvae of b.pbimeroiiterous, I 'lecopterous and r)i])terons insects, while 

 llu' aduhs li\e cbietly on slime, filamentous algae, and other vegetable matter. 



I'lirasitcs: Like .Sclii.':iipyg(ipsis slalic.ckar this species is also attacked with parasites 

 which cause brownish tubercK's on the head, cheeks, different parts of the body and the fins. 

 No intestinal jiarasitcs were found in the specimens under report. 



'" V. .\. .Aiiikin'.s work, "Die Fische dcr Gattimg Diplychus Steincl., ilire Sy.stematic und biologisclie 

 BedcutuiiK" {Tonuli, 1900), seems tu contain interesting biological accounts of Diptyclius. hut unfortunately it 

 is nut available in India. 



