FRESH-WATER FISHES OF SlAM, OR THAILAND 327 



Figure 74 — Noemachcilus bucculentus, new species: Type 

 Drawn by Miss Jane Roller. 



(U. S.N.M. No. 107942). 



dal peduncle slightly longer than deep, its length 2 in head ; head much 

 depressed, 3.8 in standard length, its depth 2.3 in its length and 1.8 

 in its greatest breadth behind eyes ; breadth of head equal to its length 

 along median dorsal line; cheeks greatly swollen; dorsal profile of 

 head nearly straight from nape to a prominence over nostrils, when 

 the profile is decurved to tip of snout; snout viewed from above 

 pointed, viewed from side slightly pug-nosed ; length of snout 2.6 times 

 in head ; eyes small, dorsolateral in midlength of head, about 5 in head, 

 2.9 in snout, and 1.25 in interorbital space ; nostrils very close together 

 and much nearer to eye than to tip of snout, posterior nostril distant 

 from eye somewhat more than 0.5 diameter of eye, anterior nostril in a 

 short tube formed by the nasal tentacle, which is small, and when de- 

 pressed reaches very slightly beyond posterior nostril ; mouth strongly 

 arched, its width 0.8 length of snout ; lips rather thick, lower lip with a 

 slight median incision ; upper jaw with a broad beaklike process fitting 

 against an emargination and incision in lower jaw; inner rostral 

 barbels short, extending about halfway to nostrils; outer rostral 

 barbels longer, extending to nostrils; maxillary barbels longer than 

 outer rostral and when folded back reaching a point under posterior 

 margin of orbit ; opercular flap well developed ; ventral ends of bran- 

 chial openings separated by a space equal to length of snout; gill 

 rakers 2 + 10, wide-spaced, 0.2 length of gill filaments; scales deficient 

 on anterior half of body; lateral line nearly straight, complete. 



