104 U.S. NATIONAL MUSEUM BULLETIN 2 02 Vol. 2 



lower caudal rays 1.0 to 1.1 ; all in length of head (tip of snout to hind 

 margin of opercular flap). Depth of caudal peduncle into length of 

 caudal peduncle 1.25 to 2.0; angle of snout profile vath lengthwise 

 axis of body 47 to 50 degrees. 



Bones of preorbital and suborbital, preopercle, opercle, subopercle, 

 and interopercle all entire, though some specimens with preopercle 

 crenulate; spines of dorsal fin gradually increasing in length, with 12th 

 the longest; angles of soft dorsal and anal pointed, caudal forked, 

 lobes angular, upper rays longer than lower. Teeth of jaws in single 

 row, long, slender, slightly curved, tips bluntly pointed or rounded; 

 head scaled to a point even with nostrils, chin and preorbital not scaled. 



Coloi' in alcohol. — Head and hoiij light grayish brown to dark 

 chocolate brown, siiout and breast usually paler than back and sides; 

 body with 3 or 4 narrow transverse vertical white bars, the first 

 from nape across opercle to a point even with pectoral base, sometimes 

 indistinct, in some specimens this band represented on opercle only 

 by white spots, second bar from midway on 6th dorsal spine, curving 

 slightly anteriorly then slightly posteriorly toward anus, but usually 

 fading on belly before reaching anus, the third white bar from the 

 origin of soft dorsal to base of middle of soft anal fin; caudal peduncle 

 with broad black ring bordered anteriorly by prominent white line 

 and posteriorly, usually, with faint white line, the latter often in- 

 distinguishable from pale caudal fin; scaly sheath of dorsal brownish, 

 spiny dorsal membranes grayish brown, with narrow dark brov/n or 

 blackish margin; a black spot (ocellus in young) near outer margin 

 of 4th to 8th dorsal soft rays; anal fin very dark brown or blackish; 

 caudal yellowish or whitish with outer edges of upper and lower rays 

 blackish basally; pelvics dark grayish brown; pectorals pale grayish 

 with black basal bar on crescent-shaped spot; axil of base of pectoral 

 blackish. 



Color when alive. — -As described for preserved specimens except 

 transverse vertical bars light tan and caudal white. 



Genus POMACENTRUS Lacepede 



Pomacentnis Lacepede, Histoire naturelle des poissons, vol. 4, p. 505, 1803 

 (type species, Chaetodon pavo Bloch). 



KEY TO THE SPECIES OF POMACENTRUS FROM THE NORTHERN MARSHALL 

 ISLANDS AND ADJOINING REGIONS 



la. Dorsal spines XII; teeth of jaws uniserial. 



2a. Preorbital wide, its least width nearly equal to eye in adults; no black 

 spots on upper part of pectoral base or base of last dorsal rays; dorsal 

 fin rays XII, 15; anal 11,13 P. lividus (Bloch and Schneider) 



26. Preorbital narrower, its least width % to Yz eye in adults; black spot present 

 on pectoral base and on base of last dorsal rays though latter some- 

 what obscured. 



