Fishes of the Western North Atlantic 



417 



3b. Dorsal fin with 17 or 18 rays; gill rakers on lower limb 30 or 31 ; axillary- 

 process of pectoral not reaching middle of fin. 



flavipinnis Valenciennes 1839. 

 Buenos Aires, Argentina, 

 lb. Ventral scutes 19-25 before and only 6 or 7 behind pelvic fins, total number 

 25-32. 



4 a. Depth of body less than a third (30 "/o) of SL; scales about 60 in a lateral 

 series; gill rakers 19 on lower limb; anal with 47—52 rays. 



amazonica (Miranda-Ribeiro) 1923, p. 421. 



4b. Depth of body about equal to or greater than a third (33— 40"/,,) of SL; 



scales 33—45 in a lateral series; gill rakers 22—25 °" lower limb. 



5a. Depth of body greater than a third (37— 40*/o) of SL; ventral scutes 



19—21 before and 6 behind pelvic fins; pectoral with 13—15 rays; anal 



with 36—42 rays. harroweri Fowler 1917, p. 423. 



5b. Depth of body about equal to a third (33 "/(,) of SL; ventral scutes 25 



before and 7 behind pelvic fins; pectoral with 16 rays; anal with 45 rays. 



narragansetae Fowler 191 1, p. 426. 



Ilisha ahamazonica (Cope) 1872 



Apapa 



Figure 104 



Study Material. Three specimens, 280, 305, and 360 mm TL, 220, 234, and 

 275 mm SL, from "the Amazon River region, Para to Manaos," Brazil, USNM 

 52548. 



distinctive Characters. This species is characterized by the slender body and small 

 scales. It differs especially from related species in the very few gill rakers on the lower 

 limb of the first arch. 



Description. Proportional dimensions in per cent of standard length, and counts, 

 based on study specimens, 110— 2^] ^ mm SL. 



Body: depth 27.5-30. 



Caudal peduncle: depth 9.4—9.5. 



Head: length 25.5-27; depth 



Snout: length S-i^-S-S 

 Eye: diameter 6.2—6.8. 

 Interorbital: width 12— 13.5. 

 Maxillary: length 1 2.8-1 3.5. 

 Mandible: length 14—15. 

 Anal fin: length of base 29-31. 



Pelvic fin: length 7.5-8.1. 

 Pectoral fin: length 20.5-22.7. 

 21.5- Distance from snout to origin of: dorsal 



50-52. 



Scales: 72-75. 

 Ventral scutes: 32 or 33. 

 Fin rays: dorsal 18; anal 37-40; pectoral 

 16 or 17. 



27 



