154 BULLETIN 180, UNITED STATES NATIONAL MUSEUM 



orbital and one from nape to rear upper comer of eye ; pectoral and 



pelvics pale Pygoplites diacanthus (Boddaert) 



2&. Interoperculum " serrated or with spines posteriorly, remote from sub- 



operculum; hind margin of preorbital free, serrated or with strong 



spines ; interorbital width equal to or less than eye. 



3a. Body uniform yellowish on adults but a black spot near center of body 



on young (my specimen 31 mm.. Rose Island) ; margin of soft dorsal, 



anal, and caudal fins with a blacli line; narrow black ring around 



eye ; vertical black band across opercle ; chin and sometimes tip of 



snout somewhat pigmented with black, base of preopercular spine 



sometimes with a little black pigment ; dorsal rays XIV, 15, anal III, 



15, scales about 4G Centropyge flavissimus (Cuvier) 



3&. Body not uniformly colored yellowish as in 3a. 



4a. Anterior part of body yellowish, sharply contrasting with blackish 

 posterior part of body, change in color occurring from sixth to 

 seventh dorsal spine to just in front of anus; from nape a black 

 band extending to eye ; head dusky ; caudal fin pale or yellowish ; 

 margin of dorsal pale, pectoral pale ; dorsal rays XV, 15, anal III, 



17; scales about 46 Centropyge bicolor (Blocli) 



4b. Body with about 18 narrow transverse streaks of bluish black ; ground 

 color deep orange, paler below ; anal and dorsal edged with blue ; 

 caudal fin with a broad blue submarginal stripe ; dorsal, anal, and 

 caudal fins blackish ; pectorals and pelvics pale, dorsal rays XIV, 

 17; anal III, 15, scale'^ about 40__ Centropyge bispinosus (Giinther) 



Genus POMACANTHUS Lacepede 



Pomacanthus Lacbtedb, Histoire naturelle dos poissons, vol. 4, p. 525, 1803. 

 (Type, Chaetodon ai'cuatus Linnaeus, as restricted by Cuvier.) 



POMACANTHUS IMPERATOR (Bloch) 



Chaetodon imperator Bloch, Naturgeschichte der auslandischen Fische, vol. 3, 

 p. 51, pi. 174, 1787. 



115057, Rose Island reef, June 11-14, 1939, 1 specimen. 



115059, Tau Island, reef at Siulagi Pt., June 27, 1939, 2 specimens. 



115058, Tutuila Island, reef at Alofau, June 3, 1939, 1 specimen. 



52247, Pago Pago, Samoa, Jordan and Kellogg, 1 specimen; this collection 

 was reported upon by Jordan and 8e:ili\ 190;;. as Ilolonintlnis ijirobariensis. 



Genus PYGOPLITES Fraser-Brunner 



PligoUtes Fraser-Bkunner, Proc. Zool. Soc. London, 1933, p. 587. (Type, Hola- 

 canthus diaccmthus Boddaert.) 



PYGOPLITES DIACANTHUS (Boddaert) 



Chaetodon diacanthus Bodd.vert. Epistola . . . de Chaetodonte diacantho de- 

 scripto, p. 19, 1772. 



1150G4, Rose Island lagoon, June 12 to 20, 1939, 1 specimen. 

 52493, Pago Pago, Samoa, Jordan and Kellogg, 4 specimens. 

 56998, Pago Pago, Samoa, Jordan and Kellogg, 2 specimens. 



'o After Webor and de Beaufort, 10P.6. p. 122. 



