86 BULLETIN 189, UNITED STATES NATIONAL MUSEUM 



Genus SARDINOPS Hubbs, 1929 



Body elongate, moderately compressed; midline of abdomen not 

 sharply compressed, with rather weak scutes; mouth moderately 

 large; maxillary not extending beyond middle of eye; upper jaw with- 

 out a definite notch on midline; teeth small or absent, none on vomer; 

 opercle with rather strong radiating grooves and ridges; gill rakers 

 numerous, those of upper limb extending forward and downward 

 across the ones on lower limb ; dermal flap on vertical part of shoulder 

 girdle short and slightly 2-lobed ; opercle deeply indented over dermal 

 extension of shoulder girdle in advance of pectoral; scales regularly 

 placed, with nearly vertical radii, about 50 in lateral series; vertebrae 

 about 50; dorsal over middle of body, with about 16 to 20 rays; anal 

 with about the same number of rays, the last two enlarged; ventral 

 with 8 rays, inserted under base of dorsal. 



A single species, closely related to the "California sardine," occurs 

 in Peru. 



Fowler (1941b, p. 620) synonymized Sardinops with Arengus Cor- 

 nide without stating a reason. However, until data in support of the 

 identity are produced, I shall recognize Sardinops essentially as 

 defined by Hubbs (1929, p. 264). 



SARDINOPS SAGAX (Jenyns) 



Sardina 



Clupea sagax Jenyns, 1842, p. 134, San Lorenzo Island and Lima, Peru (original 

 description) . 



Clupanadon fimbriata Abbott, 1899, pp. 332, 334, Callao, Peru (recorded from 

 6 specimens, notes, compared with C. caeruleus). 



Clupanadon sagax Abbott, 1899, p. 334 (references). 



Sardinella fimbriata Starks, 1906, p. 778, Callao, Peru (notes). 



Sardinella sagax Evermann and Radcliffe, 1917, p. 20, Callao and Lobos de 

 Afuera, Peru (synonymy; description). — Nichols and Murphy, 1922, p. 504, 

 Chincha Islands, Peru. 



Arengus sagax Fowler, 1940b, p. 745, fig. 4, Callao, Peru; 1941a, p. 232 (refer- 

 ences; range); 1941b, p. 622 (synonymy, several nominal species united; 

 description; greatly extended range). 



Head 3.3 to 3.7; depth 4.2 to 4.6 ;D. 17 to 20; A 17 to 19; P. 17 or 18; 

 scales 52 to 60 ; vertebrae 50 to 52 (two specimens dissected) . 



Body only moderately compressed, its greatest thickness generally 

 about equal to its depth at origin of anal; caudal peduncle short and 

 rather slender, its depth 3.8 to 4.2 in head; head compressed, moder- 

 ately flat above, its greatest thickness equal to snout and fully half 

 the eye; snout blunt, 3.5 to 3.8 in head; eye 4.25 to 5.0; mouth moder- 

 ate, oblique, nearly terminal, with slight notch in upper jaw; maxil- 

 lary broad, its lower margin broadly convex, extending about to 

 middle of eye, 2.25 to 2.5 in head; mandible 1.75 to 1.9; teeth wanting; 

 gill rakers very long in adult, about as long as eye, increasing greatly 



