132 BULLETIN 214, UNITED STATES NATIONAL MUSEUM 



fin contrasting sharply with otherwise brownish body; outer K to % 

 of dorsal and anal fins pale, basal ji to % darker, separated by a 

 dark line; angle between lips about 80 to 95 degrees. 



Three specimens from the Red Sea clarifies the status of S. bipal- 

 lidus (Smith), which I first thought was the same as S. sordidus 

 Forskal. In my key on pp. 33-38, S. bipallidus would trace down 

 (with difficulty) to S. sordidus in sections 20a and 20b, or perhaps 

 to 20c. From all the species falling under those sections of the key, 

 S. bipallidus differs in having a dark squarish blotch (purplish when 

 alive) on front of snout, and a pale (Ught green when alive) caudal 

 peduncle and caudal fin; the basal third of anal fin is red, outer % 

 light green. The chief color marks are illustrated in the figure. 

 The width of the dark broad band on the anal fin of S. sordidus, 

 narrower in S. bipallidus along with the purplish blotch on the snout, 

 is especially charact3ri3tic. 



No doubt a study of new material from various parts of the world 

 will make it possible to validate other doubtful species, now placed 

 in synonymy by me. 



