352 BULLETIN 189, UNITED STATES NATIONAL MUSEUM 



concave, its teeth very broad on posterior half or so of plate, not dis- 

 tinctly outlined anteriorly and on center of plate; upper pharyngeal 

 plates each with a series of very broad teeth (a second series not defi- 

 nitely visible in the small example dissected) ; gill membranes narrowly 

 united ; lateral line interrupted on first or second oblique series of scales 

 behind dorsal fin, resumed lower down on caudal peduncle, on the 

 same series of scales or on one series farther forward; scales large, 

 those on base of caudal largest, extending forward on interorbital 

 space to about middle of eye, three to five scales on median line in 

 advance of dorsal, five in advance of ventrals, and two between bases 

 of ventrals, one complete row and a partial row between lateral line 

 and first dorsal spine, two rows on cheek, slightly embedded, each 

 row usually with five scales (one of eight specimens with six scales 



Figure 72. — Scarus dubius, new species. From the type, 85 mm. long, Lobos de Afuera Bay, 

 Peru (U.S.N.M. No. 128113). 



in upper row, and two with four scales in lower row) ; lower posterior 

 margin of opercle with seven or eight scales, including the large one 

 at posterior angle; dorsal fin continuous, the spines only moderately 

 flexible, but not pungent; soft part of dorsal anteriorly a little higher 

 than spinous part; caudal broadly convex; anal similar to soft part 

 of dorsal, its origin a little in advance of middle of dorsal; ventral 

 inserted under base of pectoral, its margin convex, the innermost 

 ray about three-fourths length of the first divided ray, the second 

 divided ray longest, 1.75 to 2.1 in head; pectoral broadly rounded, 

 the upper rays longest, the lower ones decreasing gradually in length, 

 the shortest ray about half the length of the longest, the longest rays 

 reaching somewhat beyond tip of ventral, 1.3 to 1.6 in head, 4.3 to 

 4.9 in length. 



Color dark grayish brown above, pale gray below; some specimens 

 lighter than others; light colored specimens with indefinite dark 

 stripes along the rows of scales on lower part of side; a dark band 

 extending across chin from one angle of mouth to the other, followed 



