52 PROCEEDINGS OF UNITED STATES NATIONAL MUSEUM. [1885. 



ff. Pectoral fins nearly uuiform brownish, without oblique pale bar. Length 

 of pectorals, In in body, their tips scarcely reaching last 

 ray of dorsal. Ventrals, 3^ in body, scarcely reaching 

 last ray of anal. Head, 4^ in length ; depth, 5f . D. 11, 

 A. 12. Scales about 58 ; 27 before ventrals, 30 before 

 dorsal : 6 rows between lateral line and dorsal. Snout 

 rather long, equal to eye, 3^ in head. Interorbital area 

 flat, 3 in head. Ventrals scarcely dusky, without dis- 

 tinct markings; dorsal and anal plain rufipinnis, 8. 



aa. Aual fin short, its base one-half to two-thirds length of base of dorsal; its inser- 

 tion behind first ray of dorsal ; its rays 9 or 10. 

 A. Second ray of pectoral divided (first simple) ; third and fourth rays 

 longest. . 

 i. Pectoral fins without round dark spots. 

 j. Ventral fins inserted about midway between pupil and last caudal 

 vertebra. 

 )c. Dorsal and anal fins without black markings ; ventrals pale. 



Z. Base of anal If in base of dorsal ; pectoral If in length, reach- 

 ing last ray of dorsal ; ventrals 2f in body, reaching last 

 ray of anal : snout, 3f in head ; eye, 3|^. Head, 4f in 

 body ; depth, 5^. Scales, 58 : 26 before ventrals, 33 before 

 dorsal, 7 rows of scales between dorsal and lateral line; 

 D. 14, A. 9. Lower lobe of caudal about \ longer than 

 head. Pectoral fins with an oblique white band across 

 lower half of fin ; dorsal and anal plain ; ventrals white, 

 their axil scarcely dusky heterurus, 9. 



II, Base of anal 2 in base of dorsal ; length of pectorals If in 

 length of body, their tips reaching end of dorsal fin ; 

 length of ventrals 2f in body, their tips nearly reach- 

 ing last ray of anal ; last ray of anal opposite last of 

 dorsal ; lower lobe of caudal about \ longer than head ; 

 snout little pointed, 4^ in head. Eye, 2| : scales 50 ; 23 

 before ventrals ; 28 before dorsal ; seven rows of scales 

 between dorsal and lateral line. Head \\ in length ; 

 depth 5^. D. 14, A. 9. Interorbital area flat; 3 in head. 

 Pectorals black on posterior half; paler on anterior half, 

 with an ooliqne white bar, which begins in axil and ex- 

 tends two-thirds distance across the fin ; edge of pector- 

 als white ; ventrals white; the axil a little dusky; dor- 

 sal and anal plain; caudal dusky, with a dusky vertical 



shade across middle rays robustus, 10. 



Hk. Dorsal and anal tins marked with black; dorsal with one or 

 more dark blotches ; aual with a black spot on tips of 

 third to sixth rays ; ventrals black, with pale edgings, " 

 and a white spot near its base ; pectorals black, with a 

 white band running from axil obliquely backward to 

 tips of upper rays ; caudal with three dusky cross-bars. 

 Pectorals long, If in body, not quite reaching last dor- 

 sal ray ; ventrals 2|- in body, their tips nearly reaching 

 , base of caudal ; lower lobe of caudal 3^ in head. Head 

 \\ in length; depth 5J. D. 13, A. 9. Scales about 46; 

 8 rows between dorsal and lateral line. ..furcatus, 11. 

 jj. Ventral fins inserted midway between posterior margin of pre- 

 opercle and last caudal vertebra. Pectorals not uniformly 

 colored : posterior half of pectorals, ventrals, and dor- 



