338 BULLETIN 189, UNITED STATES NATIONAL MUSEUM 



maxillary scarcely reaching vertical from anterior margin of eye, 

 3.4 to 3.9 in head; teeth in a single series in each jaw, compressed, 

 with smooth, straight cutting edges; gill membranes slightly connected, 

 free from the isthmus; gill rakers about as long as pupil, 11 to 13 

 on lower and 5 to 7 on upper limb of first arch; preopercle and sub- 

 orbital each with a serrated margin; suborbital scarcely as wide as 

 pupil; lateral line ending nndcr posterior rays of dorsal; scales 

 strongly ctenoid, extending slightly fonvard of interorbital, 3 rows 

 on cheek and 3 on opercle, extending on bases of all the fins exclusive 

 of ventrals, 3 complete rows between lateral line and first dorsal 

 spine; dorsal fin continuous, the spines graduated, the last one 1.6 

 to 2.2 in head; soft part of dorsal somewhat elevated, slightly acute, 

 longest rays 1.2 to 1.6 in head; caudal with a rather shallow fork, 

 the lobes round, the upper one longest, about as long as head; anal 

 similar to soft part of dorsal, the second spine rather strong, 1.7 

 to 2.0 in head; ventral inserted under or slightly behind base of lower 

 rays of pectoral, 1.0 to 1.15 (without filament) in head; pectoral 

 broad, with slightly convex margin, about as long as head, 3.0 to 3.6 

 in length. 



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

 sides with dark vertical lines on the series of scales, or in the young 

 with alternate light and dark lines. The smaller specimens with a 

 dark ocellus at base of anterior soft rays of dorsal, and with numerous 

 bluish spots, these most numerous and distinct on head, and at bases 

 of dorsal and anal fins ; these markings missing in the larger specimens 

 but apparently not disappearing at a uniform size. Pectoral green- 

 ish to slightly dusky; other fins dark brown. 



This species, which is new to the fauna of Peru, is represented in 

 the collection furnished by the Mission by 14 specimens, 30 to 60 mm. 

 (22 to 45 mm. to base of caudal) long, all taken in Lobos de Afuera 

 Bay in rocky inlets. These fish were compared with others from 

 Panama, with which they seem to be identical. 



Range. — Mazatlan, Mexico, to northern Peru. 



Genus ABUDEFDUF Forskal, 1775 



Body ovate, strongly compressed; head short; mouth small, termi- 

 nal; teeth fixed, in a single series in each jaw, compressed, usually 

 more or less bicuspid ; suborbital with lower margin free and smooth ; 

 margin of preopercle smooth (unarmed) ; scales large, ctenoid, missing 

 only on snout; dorsal fin continuous, with about 12 or 13 spines, the 

 posterior ones shorter than some of the more anterior ones, about an 

 equal number of soft rays; anal with 2 spines and about 10 to 12 soft 

 rays. 



These fishes generally live about rocks and submerged objects. A 

 single species has been taken in Peru. 



