198 BULLETIN 189, UNITED STATES NATIONAL MUSEUM 



large, 110 in a lateral series, ctenoid on chest as elsewhere; dorsal with 23 



soft rays; anal with 22; caudal only slightly concave cabezon (p. 198) 



aa. Head smaller, more elongate, its dorsal profile not especially steep, 3.45 to 



3.8 in length; preorbital much narrower; scales smaller, 116 to 128 in 



lateral series, smooth on chest; dorsal with 23 to 26 rays; anal with 23 or 



24; caudal rather deeply lunate. 



h. Margin of preopercle strongly serrate; maxillary not covered by upper lip; 



ventral inserted below base of pectoral princeps (p. 199) 



hh. Margin of preopercle mostly entire, with only a few blunt serrae at angle; 

 maxiUary almost wholly covered by upper lip; ventral inserted a short 

 distance behind base of pectoral afRnis, new species (p. 201) 



CAULOLATILUS CABEZON Evermann and Radcliffe 



Peje-blanco; Cabez6n; Cabezudo 



Figure 43 



Caulolatilus cabezon Evermann and Radcliffe, 1917, p. Ill, pi. 10, fig. 3, Chim- 

 bote and Paita, Peru (original description; compared with C. princeps). 



Head 3.05; depth 3.1; D. VIII, 23; A. II, 22; P. 18; scales 110. 



Body rather elongate, compressed, deepest over base of ventrals, 

 tapering posteriorly, its greatest thickness equal to about half its 

 depth; profile anterior to dorsal fin definitely convex, steep over snout; 

 caudal peduncle short, compressed, 3.4 in head; snout blunt, 2.8; eye 

 4.2; interorbital 4.5; preorbital nearly as broad as eye; mouth rather 

 large, terminal, slightly oblique; maxillary not covered by upper lip, 

 reaching a little beyond vertical from anterior margin of eye, 2.5 in 

 head; teeth in a band anteriorly in each jaw, reduced to a single series 

 posteriorly, the last 2 or 3 teeth enlarged; vertical margin of pre- 

 opercle strongly serrate ; gill rakers at angle scarcely as long as pupil, 

 15 on lower and 9 on upper Umb of first arch; lateral Une complete, 

 only slightly arched; scales rather small, firm, ctenoid, ctenoid on 

 chest as elsewhere, extending forward on posterior part of interorbital, 

 present on cheek and opercle, covering lower two-thirds of dorsal, 

 extending slightly on bases of ventral and pectoral, but not on dorsal 

 or anal; dorsal fin long, continuous, the spines sharp, slender, in- 

 creasing very gradually in length from the third to the last, the first 

 two being notably shorter, the longest one 3.25 in head; soft part of fin 

 higher than spinous part, highest posteriorly, the second and third 

 rays from end of fin produced, reaching base of caudal; caudal only 

 sUghtly concave, both lobes acute, the upper one slightly the longer; 

 anal very similar to soft part of dorsal (although originally described 

 as having only one spine, it more properly should be described as 

 having two, the second one being tipped by a short filament), base of 

 fin 2.4 in length; ventral inserted under base of pectoral, pointed, 1.75 

 in head; pectoral moderately long, pointed, the seventh ray (counting 

 downward) longest, 1.3 in head, 4.0 in length. 



Color of old preserved specimen uniform brownish above, pale 



