254 PROCEEDINGS OF THE NATIONAL MUSEUM vol.94 



6.10 (6.20; 6.51) ; distance between the posterior pair of nasal openings 

 5.48 (5.32; 5.58); tip of snout to dorsal origin 34.7 (35.1; 33.6); snout 

 to anal origin 59.0 (58.7; 59.0); snout to pectoral insertion 24.2 

 (25.1; 24.2); snout to pelvic insertion 40.8 (42.4; 41.4); snout to anus 

 53.7 (54.4; 54.2); length of maxillary barbel 10.2 (8.70; 9.46); length 

 of inner or anterior mental barbel 9.05 (9.24; 6.98) ; length of posterior 

 (outer) mental barbel 10.1 (9.78; 9.61); length of anal base 31.8 

 (32.1; 31.5); length of caudal peduncle or distance from base of last 

 anal ray to midbase of the caudal fin 13.2 (14.1; 14.7); least depth 

 of the caudal pedimcle 13.2 (13.9; 13.9); length of first simple ray of 



dorsal fin 19.5 (19.3; ); length of longest or first branched ray 



of dorsal 17.0 (17.5; 17.2); length of first simple ray of pectoral fin 

 17.9 (16.6; 18.9); length of first or longest branched ray of pectoral 

 fin 14.7 (14.9; 15.5); length of longest branched ray of pelvic fins 

 11.0 (10.3; 10.4); length of longest upper ray of caudal fm 23.8 (20.1; 

 24.0); length of longest lower ray of caudal fin 24.7 (19.7; 24.3); 

 shortest middle ray of caudal fin 11.6 (12.5; 13.8); width of head 

 across base of pectorals 18.4 (19.6; 18.0). 



The following counts were made, respectively: Anal rays iii,23 

 (iii,23; iv,22); dorsal i,6 (i,6; i,6); pectoral i,8-i,8 (i,9-l,9; i,8-i,8); 

 pel vies always i,5; branched rays of caudal fin 15 (15; 15); gill rakers 

 (2 + 6; ). 



Head rounded anteriorly, body compressed posteriorly, snout 

 projectmg a little beyond the lower jaw, so that mouth is subterminal; 

 anterior nostrils at sides of tip of snout, this pair a little farther apart 

 than posterior pair; eyes embedded, without free margins; gill mem- 

 branes broadly joined to isthmus, the gill opening wide and extending 

 a Uttle farther below the pectoral base than above it; gill rakers 

 short about 2 + 6 or 7 ; the pair of maxillary barbels lying in a groove, 

 as do the two pairs of mental barbels on underside of head; first 

 ray of dorsal and pectoral produced beyond branched rays in males; 

 anus equidistant between midcaudal fin base and tip of chin; caudal 

 fin deeply concave; pectoral fm a little rounded; dorsal truncate 

 posteriorly; pelvics at midline joined to body and to each other; 

 caudal peduncle as long as deep; teeth conical in three of four rows 

 on premaxillaries and on dentaries and in one or two irregular rows 

 on the vomer, the latter parallel with premaxillary band of teeth, 

 not interrupted in the middle. 



Co/or.— Brownish black, dark or grayish above, silvery below, the 

 upper sides with numerous blackish blotches, some a little larger 

 than eye; all margins of caudal fin edged with a narrow white band; 

 paired fins pale; dorsal plain grayish, anal with a few black pigment 

 cells mostly posteriorly; peritoneum mostly pale. 



Remarks. — This new subspecies is separated from all related forms 

 as indicated in the key on pages 252-253. 



