FRESH-WATER FISHES OF SIAM, OR THAILAND 



81 



Coloration: Bluish silvery; a glistening round black spot a little 

 larger than pupil immediately behind head ; a faint median dark stripe 

 on back from head halfway to dorsal fin; back at base of dorsal and 

 on upper part of caudal peduncle dark; dorsal and pectorals with 

 blackish dots distally, caudal lobes dusky. 



Type. — A specimen (U. S. N. M. No. 107959) , 5.8 cm. long, was taken 

 in the Pasak River at Pechabun, Central Thailand, February 23, 

 1934, by Luang Masya Chitrakarn. 



Remarks. — This fish is much deeper in color than the Indian and 

 Burman species O. cacMus., which it resembles in plainness of coloration 

 and which, moreover, has 55 to 66 scales in the lateral line. It is like- 



FiGURE 4. — Chela mouholi, new species: Type specimen (U. S. N. M. No. 107959). Drawn 



by Miss Jane Roller. 



wise a much deeper colored fish than C. lauhuca and differs otherwise 

 in the features shown in the key. The closest relationship seems to 

 be with C. caeruleostigmata., from which it may be easily distinguished 

 by its squamation (scales in lateral line 31 as against 35, scales on trans- 

 verse series 7-1-5 as against 9-1-3, scales around caudal peduncle 14 

 as against 12) and coloration. 



Named for A. H. Mouhot, intrepid pioneer explorer and zoological 

 collector in the jungles of Eastern Thailand, 1858-60. He collected 

 fishes in the type locality of C . mouhoti^ including a new species of 

 Chela (i. e., Oocygaster) described by Giinther as siamensis. 



CHELA LAUBUCA (Hamilton) 



Cifprinus laubuca Hamilton, 1822, pp. 260, 384 (northern Bengal). 

 Laubtcca siamensis Fowleb, 1939, p. 64, fig. 14 (Trang). 



The inclusion of this species of India, Burma, and Sumatra in the 

 present catalog depends in part on the existence of a typical specimen 



