FAMILY POMACENTRIDAE — WOODS AND SCHULTZ 83 



Color in alcohol. — Light brownish; spiny dorsal with blackish 

 membranes distally. 



Color when alive. — Bright golden yellow; dorsal fin dusky distally. 



ABUDEFDUF SORDIDUS (Forsk&I) 



Plate 86,D 



Chaetodon sordidus ForskIl, Descriptiones animalium . . . , pp. xxiii, 62, 1775 

 (type locality, Djedda, Red Sea). 



SPECIMENS STUDIED 



Bikini Atoll: 13 stations, 22 specimens, 19 to 146 mm. in standard length. 



Eniwetok Atoll: 3 stations, 6 specimens, 84 to 149 mm. 



Rongelap Atoll: 2 stations, 8 specimens, 20 to 130 mm. 



Rongerik Atoll: 1 station, 4 specimens, 20 to 34 mm. 



Guam: 4 lots, 5 specimens, 18 to 75 mm. 



Saipan: 2 lots, 3 specimens, 17 to 28.5 mm. 



Description. — Dorsal fin rays XIIT,15 or 16 (usually 15); anal rays 

 11,14 or 15; pectoral rays ii,17 (rarely i,18); scale rows from upper 

 edge of gill opening to base of caudal rays 28 or 29 (usually 28), with 

 3K between scaly dorsal sheath and lateral fine, 14 between lateral 

 line and origin of anal; upper part of lateral line with 22 perforated 

 scales; gill rakers 11 + 1 + 15 (2 counts). 



Depth of body 1.6 to 1.9; head 2.7 to 3.0; both in standard length. 

 Snout 3.0 to 3.8, eye 2.9 to 4.15; preorbital width 6.2 to 9.7; length of 

 upper jaw 3.6 to 3.7; postorbital part of head (hind margin of eye to 

 upper edge of gill openmg) 2.9 to 3.0; interorbital width 2.8 to 3.6; 

 depth of caudal peduncle 1.8 to 2.0; length of pectoral fin 1.0 to 1.2, 

 of pelvic fin 0.9 to 1.1, of fifth dorsal spine 1.8 to 2.2, of upper caudal 

 ray 0.8 to 1.0; of lower caudal ray 0.9 to 1.0; all in length of head (tip 

 of snout to hind margin of opercular flap). Depth of caudal peduncle 

 in its length 0.8 to 0.9; angle of snout profile with lengthwise axis of 

 body 50 to 60 degrees; snout profile convex. 



Teeth of jaws long, cylindrical at base, flattened, truncate, tips 

 entire in specimens over 100 mm., slightly notched in specimens 50 to 

 60 mm. and trifid in young; preorbital and suborbital entire, naked; 

 preopercle entire, its posterior and ventral lines not scaled; opercle 

 with distinct broad, flat, triangular spine, head scaled on interorbital 

 to front margins of eyes; chin naked; interorbital flat in young, 

 strongly convex in largest specimens; width of preorbital increasing 

 with length of body; soft dorsal, anal, and caudal lobes rounded, 

 pectoral angular, pel vies pointed. 



Color in alcohol. — Lips pale, naked portions of snout greyish, back 

 and sides with 10 alternating bands of light reddish brown and dark 

 reddish brown or uniformly dark reddish brown; young specimens up 



