288 PATAGONIAN EXPEDITIONS: ZOOLOGY. 



scales of cheek irregular in size, those near edge the smallest; opercular 

 scales as large as those on body. Eye i# in snout, if in interorbital, 

 6i in head ; mouth terminal, jaws equal, profile slightly concave from 

 middle of occipital process to tip of maxillary process. 



Preorbital serrate ; vertical limb of preopercle finely serrate, lower limb 

 of preopercle with strong antrorse spines, more or less aggregated in 

 groups of two or three. 



Opercular spine as in trncha, subopercle and interopercle finely serrate. 



Gill-rakers about t the diameter of pupil, 9+13. 



Distance of first dorsal spine from tip of snout 2f in the length ; fourth 

 dorsal spine highest, more than half length of head ; caudal emarginate ; 

 ventrals if in head, pectorals i^. Scales as in tritcha. 



Sides yellowish without spots aside from the chromatophores giving the 

 darker color of the back ; left dorsal and caudal very faintly spotted, other 

 fins plain. 



D. X, 1 1 or 12 ; A. iii, 9; scales 7^ to 9-66 to 70-18. 



27. Percichthys melanops (Girard). 



(Plate XXXVI, Figs. 2, 2a and 2b) 



Percichthys melanops Girard, Proc. Acad. Nat. Sci. Phila. VII, 1854, 197 



(Rio de Maypu, Chili) ; id., U. S. Nav. and Astron. Exped. 233, pi. 



XXX, figs. 1-5, 1855 (Rio de Maypu, Chili) ; Gunther, Cat. Fish. Brit. 



Mus. I, 61, 1859; Jordan & Eigenmann, Bull. U. S. Fish Com. 



VIII, 428, 1890; Boulenger, Mem. Soc. Sc. Chile IV, 13, 1894; id.. 



Cat. Fish. Brit. Mus. I, 120, 1895; Delfin, Catalogo Feces de Chile, 



(Rio Maipo, Central Chili ; Colima). 

 Percosoma melanops Gill, Proc. Acad. Nat. Sci. Phila. 51, 1861. 

 Perca pocJia Philippi, Arch. Wiegm. 1863, 210 (Santiago, Chili). 

 PercichtJiys pocha Jordan & Eigenmann, Bull. U. S. Fish. Com. VIII, 



428, 1890 (Curico, Chili). 

 The southernmost record for this species is Curico, Chili, about 100 

 miles north of the source of the Neuquen on the Pacific slope. 



Body ovate, deepest below first dorsal spine. Maxillary reaching 

 scarcely to vertical from anterior margin of orbit, 3 in head. Teeth of 

 lower jaw in a band widest near tip, and tapering to a single series behind, 

 some of the lateral teeth longer than the others ; teeth of upper jaw in a 



