i94i CATALOGUE OF FISHES OF TORTUGAS ^5 



behind eye, and other minor yellow markings on head; basal half of pectoral 

 more or less silvery; opercular border black." 



The following measurements and enumerations are based on 11 specimens, 

 ranging in length from 134 to 255 mm., standard length no to 205 mm.: Head 

 3.3 to 3.5; depth 2.1 to 2.3. Eye in head 3.0 to 3.3; snout 2.9 to 3.3; interorbital 2.4 

 to 2.9. D. XI,i2 J /2 or 13/4; A. III,nJ4 or 12% 5 scales below lateral line 55 to 57. 



That Dr. Longley regarded K. metzelaari as a synonym of this species was 

 indicated in his copy of Jordan, Evermann, and Clark's ChecJ{ list. 



Atlantic coast of tropical America, straying northward to Cape Cod; sup- 

 posedly occurring also in the eastern Atlantic. S. F. H. 



Kyphosus incisor (Cuvier and Valenciennes). Yellow chub 



Pimelepterns incisor Cuvier and Valenciennes, Hist. nat. poiss., vol. 7, 1831, p. 198 — Brazil. 

 Pimelepterus flavolineattis Poey, Repertorio, vol. 1, 1866, p. 319 — Havana. 



This fish schools year after year at the same spots, such as the coral stacks off 

 Loggerhead bank, other great heads in 2.5 fathoms, a rugged bit of ancient sub- 

 merged shore line off the Laboratory wharf, and an old wreck off Loggerhead 

 Key. 



It feeds chiefly on algae, including much Sargassum. 



Its pattern is one of alternately blue and brassy yellow streaks, with the former 

 occupying the median position on the scale rows; head with a subocular pale 

 streak half the width of pupil, bounded by yellow; a dash of yellow above, 

 before, and behind eye; a firm line from angle of mouth almost to preopercular 

 border; pectoral basally faintly tinged with the yellow. In an alternative pattern 

 conspicuous light spots appear on a dark ground, commonly shown by fish that 

 are chasing others. 



A figure drawn for Jordan and Evermann (Bull. U. S. Nat. Mus., No. 47, pt. 4, 

 1900, fig. 559) and published by error as Kyphosus sectatrix has been republished 

 under the same name by Evermann and Marsh (Bull. U. S. Fish Comm., vol. 20, 

 pt. 1, 1900 (1902), p. 212, fig. 63). The specimen drawn (U. S. Nat. Mus. no. 

 20635) 1S clearly K. incisor. Its measurements and proportions are as follows: 

 Standard length 157 mm., depth 64 mm. (2.45), head 40 mm. (3.92), eye 11 mm. 

 (3.63 in head), interorbital width 16 mm. (2.5). D. Xll,i^y 2 ; A. IIL12V2; gill 

 rakers 22. W. H. L. 



The following proportions and enumerations are from a table found among 

 Dr. Longley's papers, based on 12 specimens, 150 to 285 mm. long: Head 3.6 to 

 4.2; depth 2.3 to 2.6. Eye in head 3.3 to 3.9; snout 3.0 to 3.5; interorbital 2.3 to 2.7. 

 D. Xl,i^y 2 or 14V2; A. IU,12Y 2 or 13%; scales 62 to 65 (counted below lateral 

 line). 



Atlantic coast of tropical America. S. F. H. 



Family GERRIDAE. Mojarras 



In the west Atlantic Gerridae, at least, the first two interhemal bones are fused 

 to form a single support for the corresponding anal spines. What part is played 



