106 BULLETIN 188, UNITED STATES NATIONAL MUSEUM 



2&. Lateral line formed of 10 to 23 perforated scales ; origin of dorsal fin behind 

 base of ventrals. 

 3a. Perforated scab s in lateral line 10 to 14 ; circumpeduncular scales 12, a 



broad black band from head to base of caudal fin borapetensis 



36. Perforated scales in lateral line about 23 ; circumpeduncular scales 14 ; a 



narrow black band from ej-e to base of caudal fin palustris 



16. Lateral line complete. 

 4a. Scales between lateral lines over narrowest part of caudal peduncle 9; 

 a broad silvery band from head to base of caudal fm. 

 5a. Origin of dorsal fin midway between tip of snout and base of caudal fin, 

 over eleventh scale of lateral line; circumpeduncular scales 12; caudal 



fin with a diffuse dark edge posteriorly arg'yrotaenia 



56. Origin of dorsal fin midway between tip of snout and posterior half or 

 tip of middle caudal rays, over fourteenth scale of lateral line; cir- 

 cumpeduncular scales 16 (or 14) ; caudal fin with a sharply defined 



black edge posteriorly retrodorsalis 



46. Scales between lateral lines over nari'owest part of caudal peduncle 7. 



6a. Origin of dorsal fin before or at middle of line from tip of snout to 



hindmost scales on caudal base and above or slightly behind origin 



of ventral fins. 



7c. Each caudal lobe with a black subterminal or terminal band ; a dark 



or bluish silvery band from head to base of caudal fin ; a dark 



median dorsal stripe; a dark line on each side over the base of 



anal fin, the lines uniting behind fin and running medianly on lower 



side of caudal peduncle trilineata 



76. Caudal fin with a narrow, sharply defined black posterior edge which 

 may be wider on tips of lobes; no dark longitudinal band but a 

 narrow dark longitudinal streak deficient anteriorly and most dis- 

 tinct opposite dorsal and anal fins; no dark line at base of anal 

 fin, no dark median stripe, and no dark spot on caudal 



peduncle layangi 



7c. Caudal lobes without a dark subterminal or terminal band ; a dark 

 band from head to base of caudal fin, becoming expanded into an 



oval spot on caudal peduncle cromiei 



66. Origin of dorsal fin behind or at middle of a line from tip of snout to 



hindmost scales on caudal base and always behind origin of ventral 



fins. 



8a. A sharply defined black band from tip of snout to posterior end of 



middle caudal rays ; dorsal and anal fins with a distinct black mark 



anteriorly ; pectoral fins longer than head einthovenii 



86. A blackish band from head to base of caudal fin ; pectoral fins shorter 



than or equal to head. 



9a. Dark longitudinal band rather broad and of uniform intensity 



throughout; caudal fin posteriorly with a sharply defined black 



edge widest on tips of lobes; pectoral fins shorter than 



head rasbora 



96. Dark longitudinal band of various extent ; pectoral fins shorter than 

 head, rays i,14. 

 10a. Black longitudinal band may be continuous from head to caudal 

 base or may begin below dorsal ; a black median band on back 

 from nape to caudal fin; a round black spot above anterior 

 base of anal fin, may be faint or lacking; scales in lateral line 

 26 to 30 lateristriata lateristriata 



