THE SHORE FISHES OF PERU 339 



ABUDEFDUF SAXATIUS (Linnaeus) 



Chaetodon saxatilis Linnaeus, 1758, p. 276, "India," probably meaning West 

 Indies (diagnosis). 



Abudefduf saxatilis Evermann and Radcliffe, 1917, p. 123, Lobos de Afuera, 

 Peru (synonymy; diagnosis, based on one small specimen). — Meek and 

 Hildebrand, 1925, p. 701, pi. 70, Panama, both coasts (synonymy; descrip- 

 tion; range). 



Head 3.0 to 3.2; depth 1.7 to 1.8; D. XIII, 13 or 14; A. II, 11 or 12; 

 P. 19 or 20; scales (vertical series along middle of side) 26 to 28. 



Body ovate, strongly compressed, its greatest thickness scarcely 

 more than a third its depth; back elevated; dorsal outline anteriorly 

 more strongly convex than ventral; caudal peduncle short, deep, 

 strongly compressed, 1.9 to 2.0 in head; snout short, somewhat pointed, 

 3.9 to 4.2; eye 2.7 to 3.15; interorbital 3.2 to 3.5; mouth small, 

 slightly oblique, terminal; maxillary scarcely reaching vertical from 

 anterior margin of eye, 3.4 to 3.55 in head; teeth in a single series in 

 each jaw, compressed, rather definitely bicuspid; gill membranes 

 slightly connected, free from the isthmus; gill rakers about as long as 

 pupil, 18 or 19 on lower and 6 or 7 on upper limb of first arch; pre- 

 opercle and suborbital with smooth (unarmed) margins; suborbital 

 very narrow, scarcely half width of pupil; lateral line ending under 

 posterior rays of dorsal, reappearing with slight suggestion of pores 

 on middle of peduncle; scales ctenoid, extending on interorbital, but 

 not on snout, 2 principal rows on cheek and 2 on opercle, extending 

 on bases of all the fins except ventrals, 4 complete rows between 

 lateral line and first dorsal spine; dorsal fin continuous, the fourth to 

 sixth spines slightly longer than the succeeding ones, 1.6 to 2.2 in 

 head; soft part somewhat elevated, scarcely angulate, the longest 

 rays, 1.25 to 1.5 in head; caudal moderately forked, lobes somewhat 

 pointed, the upper one longest, a little longer than head; anal similar 

 to soft part of dorsal, its margin more convex, its longest rays of 

 about the same length, the second spine rather strong, 1.8 to 2.3 in 

 head; ventral inserted under base of lower rays of pectoral, 1.0 to 1.15 

 (without filament) in head; pectoral broad, with nearly straight 

 margin, longest rays in upper part of fin, generally slightly longer 

 than head, 2.9 to 3.0 in length. 



Color dark brown above, only a little lighter underneath; side with 

 five or sLx vertical bars, the first one (very obscure) extending from 

 occiput to base of pectoral, next two under spinous part of dorsal, 

 the fourth under anterior soft rays of dorsal, the fifth under last rays 

 of dorsal, and a suggestion of a sixth one on caudal peduncle; spinous 

 part of dorsal, base of soft part of dorsal and caudal, most of anal, and 

 ventral very dark; pectoral, distal part of soft dorsal and caudal 

 largely colorless. 



The description is based on the five specimens, 70 to 85 mm. (50 to 



