FRESH-WATER FISHES OF SIAM, OR THAILAND 



161 



* Deduced from figure; not given in text. 



tThe figure of the type in Sauvage's 1881 paper shows an incomplete row of dark spots along side and 

 some vague spots below; the inference is that the colors ui the preserved specimen faded and were overlooked 

 by Sauvage but were in part detected by the artist. 



The barbels are subject to variation, but are usually absent. Day 

 (1878, vol. 2) shows none in his figure but states that "a rudimentary 

 rostral or maxillar}'^ pair may be present." In Thailand, if either pair 

 is in evidence it is the maxillary. 



Europeans and Americans, observing this silvery, dark-spotted 

 fish in clear swift streams in Northern Thailand, have sometimes been 

 misled into believing the fish to be a trout. 



A vernacular name used on the Meklong is pla nang ao. 



Genus CIRRHINUS Oken 



Cirrhinus Oken, Isis, 1S17, p. 1182a. (Type, Cyprinus cinhosiis Bleeker.) ' 



The cirrhinid fishes of Thailand form a fairly distinct group having 

 a small but broad mouth, deficient or very thin lower lip, small post- 

 symphyseal knob in lower jaw, triserial pharyngeal teeth, various de- 

 velopment of barbels, dorsal fin arising in advance of ventrals and 

 having 7 to 12 branched rays, the last simple ray nonosseous and non- 

 denticulated, and branched anal rays nimibering 5. 



Four species have been listed as occurring locally and may be recog- 

 nized as follows : 



la. A pair of maxillary barbels present; scales in lateral line 32 to 38; scales 



around caudal peduncle 20. 



2a. Maxillary barbels usually present, but often absent or so small as to be 



overlooked in postlabial groove ; rostral barbels as described in type never 



seen In Siamese examples ; coloration of body and fins plain jullieni 



