THE SHORE FISHES OF PERU 185 



aa. Anal fin normally with 7 soft rays; gill rakers fewer (except in conceptione) ; 



eye smaller, generally more than 4.0 in head; caudal peduncle usually 



deeper, less than 3.5 in head; base of soft dorsal not black. 



b. Scales large, 52 to 58 in a lateral series, 4 or 5 complete longitudinal rows 



between anterior spines of dorsal and lateral line, 5 or 6 oblique rows on 



cheek macrop onaa 



bb. Scales smaller, more than 58 in a lateral series, 6 or more complete rows 



between anterior spines of dorsal and lateral line; 7 or more oblique rows 



on cheek. 



c. Spines at angle of preopercle graduated in each direction from center of 



cluster, the two center ones not especially enlarged or definitely more 



divergent than the others, about 10 spines more or less enlarged; 11 



to 14 gill rakers on lower limb of first arch. 



d. Snout rather blunt; lower jaw not projecting strongly, its tip definitely 



below the general dorsal outline of head; scales on opercle notably 



larger than those on cheek, 4 or 5 in an oblique series below base of 



opercular spine; caudal deeply concave, or forked; pectoral rather 



symmetrically rounded i pacificum. 



dd. Snout pointed; lower jaw projecting strongly, its tip continuous with 

 the general dorsal outline of head; scales on opercle scarcely larger 

 than those on cheek, 6 or 7 in an oblique series below base of oper- 

 cular spine; caudal much less deeply concave, merely lunate; pectoral 



obliquely rounded maximum, new species (p. 185) 



cc. Two center spines of cluster at angle of preopercle much enlarged and 

 strongly divergent, 4 to 6 spines more or less enlarged; 15 or 16 gill 

 rakers on lower limb of first arch; snout rather blunt; lower jaw pro- 

 jecting slightly, its tip definitely below the general dorsal outline of 

 head conceptione (p. 187) 



DIPLECTRUM MAXIMUM, new species 



Figure 42 



Dipledrum conceptione Evermann and Radcliffe (in part not of Cuvier and 

 Valenciennes), 1917, p. 75, pi. 7, fig. 2, Lobos de Tierra and Paita, Peru 

 (synonymy; description and figure, both based on a specimen which appar- 

 ently is of the new species herein described). 



Head 3.1; depth 4.1; D. X, 12; A. Ill, 7; P. 17; scales 7-73. 



Body quite elongate, moderately compressed, its greatest thickness 

 about three-fourths its depth; dorsal profile anteriorly nearly straight; 

 caudal peduncle rather compressed, 2.7 in head; snout rather narrow, 

 and pointed, 3.5; eye 4.4; interorbital 6.6; mouth large, oblique; 

 lower jaw strongly projecting, entering the general outline of the back; 

 maxillary extending opposite posterior margin of pupil, 2.2 in head; 

 teeth as in D. conceptione; angle of preopercle greatly produced, with 

 about 10 more or less enlarged spines, the center ones not much larger 

 than some of the others and not strongly divergent, the vertical 

 margin strongly though finely serrate, the horizontal margin smooth; 

 gill rakers at angle about half length of eye, 12 more or less developed 

 on lower, and 7 on upper limb of first arch; scales firm, strongly 

 ctenoid, 10 oblique rows on cheek, and 6 or 7 in an oblique series 

 below base of opercular spine; dorsal moderately notched, the fourth 



