FRESH-WATER FISHES OF SIAM, OR THAILAND 263 



DISCOLABEO FISHERI Fowler 



Discolabeo fisheri Fowler, 1937, p. 210, figs. 177, 178 (Tachin). 



This species was described and known only from two specimens, 

 42 and 43 mm. long, from the Tachin River, Central Thailand. 



Although said by Fowler to be allied to l^ylognathus^ it seems closer 

 to Garra, as Tylognathus has no mandibular sucking disk. 



Genus EPALZEORHYNCHOS Bleeker 



Epalzeorhynchos Bleeker (136), Nat Tijdsclir. Nedeii. ludie, vol. 9, pp. 258, 270. 

 (Type, Bar'bus Tcalopterus Bleeker.) 



This well-differentiated genus is characterized by an elongate, cylin- 

 drical form; small, conical head ; overhanging snout with a small mov- 

 able lateral lobe; skin of rostrum continuous with upper lip, which 

 is fringed and covers the oral orifice when the mouth is closed; lips 

 connected by a f renum at the corners of the mouth ; one or two pairs 

 of barbels ; narrow, subvertical gill openings, gill membranes broadly 

 joined to isthmus; pharyngeal teeth in three rows; short dorsal fin 

 without osseous rays, beginning in advance of the midlengtli ; anal fin 

 with five branched rays; venti-al fins inserted under the dorsal, and 

 other features. The five known species, all occurring in Thailand and 

 two herein described as new, may be distinguished as follows : 



la. Two rostral and 2 maxillary barbels. 

 2a. Scales (tube-bearing) in lateral line 34 to 36, in transverse series 5.5-1-6.5 ; 

 a dark brown longitudinal band from snout to end of middle caudal raj's, 

 separated from dark back by a narrow whitisb streak ; dorsal, anal, and 



ventral fins with a broad black median band kalopterus 



26. Scales (tube-bearing) in lateral line 28, in transverse series 4.5-1-1.5; 

 reddish brown above ; an obscure dark brown band extending from 

 midlength of body to caudal peduncle; a sharply defined round black 

 spot on caudal peduncle and a curved black stripe across base of caudal 

 fin, these markings occupying a light area, the posterior part of the 

 caudal fin being pale yellow; middle of back from head to caudal fin 

 with a narrow brown band ; no black band on anal and ventral fins, 



median part of dorsal membranes blackish kalliurus 



16. Two rostral barbels, no maxillary barbels; dorsal, anal, and ventral fins 

 with no black band. 

 3a. Rows of scales around narrowest part of caudal peduncle 16. 



4a. Body marked with a sharply defined black longitudinal band— siamensis 



46. Body marked with a large round black spot on caudal peduncle— coatesi 



36. Hows of scales around narrowest part of caudal peduncle 14 ; body marked 



with numerous small, irregular black flecks stigmaeus 



EPALZEORHYNCHOS KALOPTERUS (Bleeker) 



Barbus kalopterus Bleeker, 1851 (26), p. 13 (Bandjermassing, Borneo). 



While this species was reported by Bleeker to be .not rare in rivers 

 of Sumatra and Borneo, it appears to be a fish of great rarity and very 



