106 tr.S. NATIONAL MUSEUM BULLETIN 202 Vol. 2 



96. Dorsal spines gradually increasing in length to last; large black 

 spot across entire pectoral base; body ground color dark 

 reddish brown; vertical fins all dark, except posterior half 

 of anal, pel vies dark, pectoral pale; dorsal rays XIII, 14; 



anal II, 13 P. raelanopterus Bleeker 



76. Opercle with a small black spot, sometimes obscured by blackish 



background coloration; orbital ring (preorbital and suborbital) 



naked, and without spines; greatest depth about 2.5 in standard 



length. 



10a. Dorsal rays usually XIII, 14; anal 11,15; background coloration 



dark brown dorsally (pale spots on head and on scales 



indistinct or absent) from rear of base of soft dorsal forward, 



including head, then abruptly whitish or pale posteroven- 



trally from level of lower edge of pectoral base posteriorly, 



including caudal peduncle and caudal fin; spiny dorsal dark 



brown; soft dorsal pale; anal fin pale, except distal edge has 



a black line P. coelestis Jordan and Starks 



106. Dorsal rays usually XIII, 13; anal 11,13 or 14, usually 11,14; 

 Ijackground coloration light brown with vertically elongate 

 white streaks on scales and posteroventrally, body not 

 abruptly pale or white; caudal peduncle dusky; caudal 

 fin pale or whitish P. caeruleus ^a (Bloch) 



POMACENTRUS LIVIDUS (Bloch and Schneider) 



Plate 89, A 



Chaetodon lividus Bloch and Schneider, Systenia ichthyologiae . . . , p. 235, 1801 

 (type localitj'. Pacific Ocean). 



SPECIMENS STUDIED 



Guam: Point Oca, December 25, 1945, Gressitt, 1 specimen, 84.5 mm. in 

 standard length. 



Description. — Dorsal fin rays XII, 15; anal rays 11,13; pectoral ii,16; 

 transverse scale rows from upper edge of gill opening to base of caudal 

 rays 27, with 2)i between lateral line and origin of spiny dorsal, 10 be- 

 tween lateral line and origin of anal; upper part of lateral line with 18 

 tubular scales; gill rakers 8 + 1 + 14. 



Depth of body 2.0; length of head 3.2; both in standard length. 

 Snout length 2.8; eye 3.8; preorbital width 3.9; length of upper jaw 

 3.4; postorbital part of head (hind margin of eye to upper edge of gill 

 opening) 2.95; interorbital width 2.9; least depth of caudal peduncle 

 1.9; length of pectoral fin 1.1, of pelvics 1.0, of 13th dorsal spine 1.6, 

 of upper caudal rays 1.0, of lower caudal rays 1.1 ; all in length of head 

 (tip of snout to posterior margin of opercle) . Depth of caudal peduncle 

 in its length 1.3; angle of snout profile with lengthwise axis of body 

 68 degrees. 



M Not yet found In Marshall Islands. 



