THE SHORE FISHES OF PERU 319 



the pupil. The premaxillaries are not protractile, the skin of the fore- 

 head being continuous with the upper lip; and the ventral fins are 

 small, not reaching the vent. 



Genus CHAETODIPTERUS Lacepede, 1802 



Mouth small, with flexible teeth in narrow bands in each jaw; pre- 

 maxillaries somewhat protractile; preopercle finely serrate to nearly- 

 smooth; dorsal spines of unequal length, the third one notably longer 

 than the others; ventral fins large, generally reaching to, or beyond, 

 vent. 



One species, new to the fauna of Peru, is included in the collections 

 studied. This genus has one representative on the Atlantic and one 

 on the Pacific coast of America. The two differ principally in the 

 size and arrangement of the scales on the body, the Atlantic coast 

 species, ya6er, having notably larger scales, which are arranged in more 

 regular series. 



CHAETODIPTERUS ZONATUS (Girard) 



Ephippus zonatus Girard, 1858, p. 110, San Diego, Calif, (original description; 



reported to differ from faber of the Atlantic "by the outline of the vertical fins 



chiefly," a character that varies with age and probably is of no diagnostic 



value) . 

 Chaetodipterus zonatus Meek and Hildebrand, 1928, p. 762, pi. 76 (synonymy; 



description; compared with /after from the Atlantic; range), 



Head 3.0; depth 1.2; D. VIII-I, 24; A. Ill, 19; P. 16; scales in 

 irregular series, about 83. 



Body deep, strongly compressed, its greatest thickness about 4.5 

 in its depth; dorsal profile anteriorly steep, but not vertical, convex 

 over snout, nearly straight from interorbital to nape; caudal peduncle 

 short, strongly compressed, 2.15 in head; snout very blunt, 2.8; eye 

 3.45; interorbital 2.9; mouth small, terminal; maxillary failing to reach 

 vertical from anterior margin of eye, 3.25 in head; teeth slender, flex- 

 ible, in a narrow band in each jaw; preopercle slightly serrate; lateral 

 line strongly arched, reaching middle of side only on caudal peduncle; 

 scales small, strongly ctenoid, covering entire body, and extending 

 on all the vertical fins exclusive of spinous dorsal; dorsal fins not en- 

 tirely separate, the third spine much enlarged, about as long as head, 

 3.0 in length; soft dorsal with broadly convex margin, the longest rays 

 only a little shorter than the longest dorsal spine ; caudal with a nearly 

 straight margin; anal somewhat similar to second dorsal, but higher 

 and angulate anteriorly, its longest rays about as long as head, the 

 spines rather strong, the second the longest, 2.0 in head; ventral long, 

 reaching beyond origin of anal, the first soft ray bearing a filament, 

 the spine strong, 1.75 in head; pectoral somewhat pointed, 1.15 in 

 head, 3.4 in length, 



