482 REPORT OF rOMMISSIONEK OF FISH AND FISHERIES. 



d. Sciik's (Oiiipariitivoly laisu, li'ss than nine, in a vertical series between first 

 dorsal sjiino and tlio lateral line; ci)loration olivaeeous, the adult 

 nearly plain, the youug with two or more dusky lateral shii)es 

 which disappear with age; fins hlaekish. 

 e. Scales 5, G-52-15 (lateral line with l'.) i)ores) ; scales above lateral line on 

 anterior part of body more or less enlarged, especially in the adult ; 

 youug specimens with two black horizontal Htri])es, one of these 

 from eye to a point just before the base of caudal, Avhorc it is in- 

 terrui)ted, a rouTul black spot following at Tiase of catidal ; another 

 stripe a1)Ovo this and parallel with it; scales of anterior part of 

 back more or less distinctly marked with black si)ot8, one on each 

 Bcale, these 8i)ots not confluent. Body oblong-elliptical, the back 

 eloA-ated, the profile strongly convex at nape, becoming straigliter 

 anteriorly; interorbital area a little more than eye; mouth short, 

 the maxillary extending to anterior edge of eye; outside teeth of 

 jaws conical, notably longer and stronger than the others; i>re- 

 opercle evenly serrate on vertical edge, weaker at angle ; dorsal 

 and anal sjiines strong, second anal stronger and a little longer 

 than the highest dorsal spine, about half head; soft dorsal lower, 

 about one-third head; pectoral falcate, as long as head; caudal 

 forked. Head, 3; depth, 2^; D. xii, 16; A. in, 8 or 9; scales, 5 to 

 6-52-12 to 15; eye, 4; snout, 2f; second anal s^iine, 1|; fourth dorsal 



spine, 2 ; pectoral, 1 Surixajiensis, 54. 



ee. Scales 7, 8-46-15 (lateral line with 54 pores), scales above lateral lino 

 anteriorly not especially enlaxged; all specimens examined with 

 three or four black lateral stripes, one from eye to near base of 

 caudal, where it ceases abruptlj^, giving place to a round caudal 

 spot as in the young of A. surinametisis, also a stri^ie from scapular 

 scale to last dorsal ray, forming two spots on back of caudal 

 peduncle (this stripe wanting in A. sitrinamcHsis) ; above this, one 

 or two other stripes parallel with it; opercular membrane black. 

 Anterior i)rofile considerably steeper than in A. sttrhutmcnsls. In 

 all other respects, in specimens of the same age, this si)ecies seems 

 to agree with A. surinamensis. Head, 3 ; depth, 2;^ ; D. xii, 16 ; A. in, 

 8; eye, 2|; snoiit, 4^; preorbital, 4; pectoral, 1 Bicolor, 55. 



dd. Scales rather small, more than 9 in a vertical series between the first dorsal 

 spine and the lateral line. 

 /. Body not striped longitudinally with yellow or blue; ])reorbital nar- 

 row; gill-rakers, x+13. 

 g. Anterior part of body without jet-ltlack vertical bar; axil jet-black, 

 the spot encroaching on base of pectoral; a round black spot 

 on base of last rays of dorsal and anal; body dark gray, with 

 obscure darker streaks ; fins pale, edge of opercle dusky ; i)ectoral 

 long, li^i, in head, reaching front of anal. Body ovate, the back 

 elevated, the profih' from the tip of the short blunt snout to the 

 last dorsal ray evenly rounded ; lower profile straigliter, angulated 

 at end of base of anal; mouth moderate; teeth in broad bands, 

 the outer in both jaws longer, close-set, slender and sharp; pre- 

 operclc rather finely and not sharply serrate; dorsal fin divided 

 almost to base, the tenth spiue no longer than first; scctmd anal 

 spine stronger and a little longer than third, loAver than soft rays ; 

 caudal forked. Head, 3; depth, 2.^; D. xi, 14; A. in, 13; scales, 

 9 or 10-51-x; eye, 4; snout, 4; preorbital=:pupil: nuixillary, 3J; 

 pectoral, li^oj gill-rakers, x+lS Scai-ulaius, 56. 



