FRESH-WATER FISHES OF SIAM, OR THAILAND 167 



6c. Lateral line complete; body more elongate (depth 2.6 to 3.2) ; maxillary 



about equal to or shorter than eye; body marked by a longitudinal 



row of dark spots ; a dark spot on back at base of dorsal fin anteriorly. 



la. Dorsal fin origin over eighth scale of lateral line ; a small black spot 



on body above base of anal fin. 



8a. Origin of dorsal fin much nearer to tip of snout than to base of 



caudal fin; branched dorsal rays 8; depth of body 3.2 in standard 



length ; depth of caudal peduncle 1.5 in its length ; 4 roundish 



black spots on side of which 3 anterior are above lateral line. 1 



on caudal peduncle on each side of lateral line stig'matosomus 



8&. Origin of dorsal fin midway between tip of snout and base of caudal 

 fin ; branched dorsal rays 7 ; depth of body 2.8 in standard length ; 

 depth of caudal peduncle equal to its length ; 4 black vertical 

 bands on body all extending below lateral line; a round black spot 

 on caudal peduncle on each side of lateral line ; a black spot on 



back under posterior doi^sal raj'S sametensis 



7b. Dorsal fin origin over tenth scale of lateral line, midway between tip 

 of snout and base of caudal fin ; 6 vertically elongated black or dark 



brown spots on side above lateral line pessuliferus 



Ic. Four barbels (rostral and maxillary). 

 9a. Last simple dorsal ray osseous, uondenticulaled. 



lOff. Scales in lateral line 22 ; scales in transverse series above lateral line 

 3.5 ; predorsal scales 7 ; circumpeduncular scales 12 ; mouth moderate, 

 maxillary extending opposite anterior margin of eye ; barbels shorter 

 than eye ; dorsal fin well forward, its origin over sixth scale of lateral 

 line, nearer to tip of snout than to base of caudal fin ; dorsal and 



caudal fins plain paucisquamatus 



10&. Scales in lateral line 29 to 33 ; scales in transverse series above lateral 

 line 4.5 or 5.5 ; predorsal scales 9 to 12 ; circumpeduncular scales 14. 

 11a. Scales in lateral line 29 ; scales in transverse series above lateral line 

 4.5 ; predorsal scales 9 or 10 ; mouth moderate, maxillary extending 

 opposite anterior margin of eye ; barbels shorter than eye ; dorsal 

 fin well forward, its origin over seventh scale of lateral line, midway 

 between tip of snout and posterior base of anal fin ; dorsal and 



caudal lobes black-tipped colemani 



116. Scales in lateral line 33 ; scales in transverse series above lateral line 

 5.5 ; predorsal scales 12 ; mouth small, maxillary extending opposite 

 nostrils; barbels equal to eye; dorsal fin well backward, its origin 

 over tenth scale of lateral line midway between tip of snout and 

 base of caudal fin ; dorsal rays and membranes blackish distally ; 



caudal fin with posterior edge dusky faucis 



96. Last simple dorsal ray osseous, denticulated. 



12a. Always 28 or fewer scales in lateral line (including all tube-bearing 



scales) ; anal rays iii, 5. 



13a. Scales in lateral line 23 or 24 ; predorsal scales 8 ; scales around caudal 



peduncle 12. 



14a. Scales in transverse series from midline of back to base of ventral 



fin 5.5-1-2 or 2.5 ; last simple dorsal ray with 8 coarse serratures ; 



coloration plain wetniorei 



146. Scales in transverse series from midline of back to base of ventral 

 fin 4.5-1-2 or 2.5 ; last simple dorsal ray with numerous fine 

 serratures ; body marked by 2 black cross bands anteriorly, and 

 1 black longitudinal band posteriorly lateristriga 



