THE SHORE FISHES OF PERU 213 



p. 12), ranging up to 125 mm. in length, aU had black bands, though 

 the bands tended to become less well defined in the larger ones. The 

 Peruvian fish shows no signs of bands whatsoever. 



Range. — Known only from the type from Sechura Bay, Peru. 



Genus TRACHINOTUS Lacepede, 1802 



Pampanos 



Body usually rather short, compressed, sometimes ovate; head 

 short; snout very blunt; mouth only lightly oblique, nearly or quite 

 terminal; premaxiUaries protractile; maxillary without a distinct sup- 

 plemental bone, generally reaching about middle of eye; teeth villiform, 

 in bands in jaws, present also on vomer and palatines, and sometimes 

 on tongue, disappearing with age in some species; lateral line scarcely 

 arched, entirely unarmed, without a keel; scales very small; first dor- 

 sal composed of six spines, separate in adult, more or less comiected b}' 

 membrane in young; second dorsal and anal similar, longer than abdo- 

 men, usually more or less elevated anteriorly, sometimes greatly pro- 

 duced; caudal fin broadly forked, the lobes sometimes produced in 

 adult; pectoral never falcate, usually shorter than head. 



Two species are included in the collections from Peru. 



KEY TO THE SPECIES 



a. Second dorsal with 19 to 21 raj's; anal with 18 to 20 rays; gill rakers 16 or 17 

 on low^er limb of first arch; anterior lobes of second dorsal and anal greatly 

 produced in adult, reaching beyond base of caudal; side with about 5 black 



bars in adult rhodopus (p. 213) 



aa. Second dorsal with 24 to 27 raj's; anal with 22 to 25 rays; gill rakers 8 to 10 

 on lower limb of first arch; anterior lobes of second dorsal and anal never 

 greatly produced, rarely if ever reaching beyond middle of base of fins; 

 side without bars paitensis (p. 215) 



trachinotus rhodopus gui 



Pampano find 



Trachynoius rhodopus Gill, 1863a, p. 85, Cape San Lucas, Baja California (origi- 

 nal description, based on specimens 1 to 2 inches long). 



Trachinotus rhodopus Jordan and Evermann, 1896, p. 941 (description; syn- 

 onymy). — Meek and Hildebrand, 1925, p. 383, pi. 37, Panama Bay (syn- 

 on3'my; description; compared with T. glaucus from the Atlantic; range). 



Head 3.3, 3.2, 3.8; depth 2.3, 2.2, 1.85; D. VI-I, 21, 19, 21; A. II-I, 

 20, 19, 18; P. 18, 17, 19. 



Body rather deep, strongly compressed; back high; dorsal profile 

 quite convex, the margin trenchant in adult; head moderately long; 

 snout blunt, 3.85, 4.2, 3.9 in head; eye 4.0, 4.2, 4.6; interorbital 3.3, 

 3.1, 2.5; mouth fairly large, slightly oblique, terminal; maxUlary 

 reaching to or somewhat beyond middle of eye 2.3, 2.4, 2.55 in head; 



624264—45 15 



