FRESH-WATER FISHES OF SIAM, OR THAILAND 89 



2b. Symphyseal knob present ; barbels well developed, short, or rudimentary. 

 3a. Branched anal rays 6 to 17 ; origin of dorsal fin far posterior to midlength 

 of fish. 

 4a. Mouth small or medium, maxillary not extending beyond vertical from 

 anterior border of eye ; branched anal rays 8 or more. Size small. 

 5a. Lateral line complete ; branched dorsal rays 8 to 12 ; pharyngeal teeth 

 in 2 rows ; a shelf extending backward from lachrymal bone. 



Daniops 



5&. Lateral line complete, incomplete, or absent ; branched dorsal rays 



7 to 17 ; branched anal rays 10 to 17 ; pharyngeal teeth in 3 rows ; 



no shelf on lachrymal bone Danio 



4b. Mouth large, maxillary extending to below eye; branched anal rays 6. 



Size rather large Luciosoma 



36. Branched anal rays 5 ; origin of dorsal fin anterior to midlength of fish. 



Filirasbora 

 16. No bai'bels; symphyseal knob present; branched anal rays 5 Rasbora 



Genus ESOMUS Swainson 



Esomus Swainson, The natural history of fishes, vol. 2, pp. 185, 285, 1839. 

 (Type, Esomus vittatus Swalnson=Cyprinus danrica Hamilton.) 



Small fishes of minor fresh waters with profuse vegetation, easily 

 recognized by a pair of very long, slender maxillary barbels. The 

 pharyngeal teeth are in a single series. Three species are ascribed to 

 local waters, one of them doubtfully : 



Ic. Lateral line piercing only 4 to 6 scales anteriorly ; rostral barbel extending 



beyond eye ; a broad black band from eye to base of caudal fin danrica 



16. Lateral line piercing 11 to 18 scales and extending to ventral or anal fin. 

 2a. Rostral barbel reaching well behind eye; a narrow dark gray line from 



head to base of caudal fin goddardi 



26. Rostral barbel reaching to middle of eye ; a black band from eye to base of 

 caudal fin, always distinct posteriorly metallicus 



ESOMUS DANRICA (Hamilton) 



Cyprinus danrica Hamilton, 1822, pp. 325, 390, pi. 16, fig. 88 (Bengal). 



Fowler (1934a, 1935a) recorded this fish from Northern, Central, 

 and Southeastern Thailand, but he gave no description of his speci- 

 mens. The Academy of Natural Sciences of Philadelphia, through 

 Mr. Fowler, courteously sent to the U. S. National Museum three 

 specimens collected by R. M. de Schauensee at Bangkok in May 1934, 

 which had been identified as this species. E. danrica is marked, among 

 other characters, by an incomplete lateral line that pierces only 4 to 6 

 of the anterior scales and by a broad black band extending from 

 behind the eye to the base of the caudal fin. In the three specimens 

 cited the lateral line is somewhat variable, extending over 12 to 18 

 scales, and reaches beyond the ventral fins or to a point over the anterior 

 part of the anal fin; and the longitudinal band is represented by a 

 narrow dark stripe most distinct posteriorly. It is believed that these 



