169 



of lateral line, separated by 8 9 scales from occiput. Dorsal 

 emarginate, its height equal to the distance from hindborder 

 of operculum to nostrils, its third simple ray weakly ossified 

 and articulated. Anal truncate, its height about equal to length 

 of head without snout. Origin of ventrals separated by 2'/ 2 

 scales from 8th scale of lateral line. Ventrals shorter than 

 pectorals. Pectorals not quite as long as distance from hind- 

 border of operculum to nostrils. Caudal forked, about equal 

 to head. Least height of caudal peduncle about i ] / 2 times in 

 its length, surrounded by 12 scales. Uniform grayish, yellowish 

 white below, when young with a black patch at the base of 

 the caudal. Length at least 160 mm. [After 2 specimens from 

 Balassang river near Kurseong, British India]. 



Habitat: Sumatra [after Duncker]. - Malay Peninsula, 

 North Eastern Bengal, Southern Shan States, rivers of Hima- 

 laya range. 



2. Lissochilus sumatranus n.sp. [Fig. 68, 69, p. 167, 168]. 



3_i 



0.34.9; A. 3.5; P. 1.15; V. 1.8; L.I. 24 25; L.tr.j^. 



3* 



Height 3.1 3.2, 4 4.2 in length with caudal. Head 3.4 3.7, 

 4.5 4.6 in length with caudal. Eye 4 4.2, nearly i 1 ^ in snout, 

 which is slightly longer than interorbital space. Snout bluntly 

 convex, prominent. Upper lip rather thick. Rostral barbel about 

 equal to eye, maxillary one longer. Below the eye and reaching 

 to base of rostral barbel, a rather long patch of pores, arranged 

 in 4 irregular horizontal rows ; each pore carries a horny tubercle 

 in the centre. Origin of dorsal much nearer to snout than 

 to end of caudal, separated by 7 8 scales from occiput and 

 opposite to the 6 th scale of lateral line. Dorsal concave, its 

 last simple ray not strongly ossified, its height equal to the 

 distance from hindborder of operculum to nostrils. Anal truncate, 

 its height somewhat more than head without snout, when 

 depressed not reaching caudal. Ventrals slightly longer than 

 height of anal, reaching anus or not so far; their origin 

 separated by 2 scales from the 7 th scale of lateral line. Pectorals 

 longer than height of dorsal, reaching ventrals or nearly so. 

 Caudal nearly equal to head. Least height of caudal peduncle 

 more than i ! / 2 times in its length, surrounded by 12 scales. 

 Colour uniform, back darker; lobes of tail generally black. 



