162 U.S. NATIONAL MUSEUM BULLETIN 202 Vol. 2 



caudal peduncle or on base of caudal fin ; pelvics dusky ; pectoral pale ; 

 rear part of soft dorsal fin pale or white; usually 3 or 4 dark spots on 

 body along midlengthwise axis but sometimes lacking, more prominent 

 in the small specimens, first about opposite tips of pectorals, second 

 over front part of soft anal base, third opposite rear base of dorsal, 

 and fourth at base of caudal fin. 



Color when alive. — Plain brownish or greenish brown. 



Ecology. — This species was common in the tidal zone of the reefs, 

 especially where coral and algal growths were abundant. 



Remarks. — C. oxycephalus is characterized by its plain brownish 

 color, having no pale bars on caudal peduncle or on base of caudal 

 fin; behind the eye on the young are 2 diverging faint brownish streaks 

 which are not found on the largest specimens; these streaks are not 

 exactly in the same position as the dark streaks around the eye of 

 C. chlorourus. 



CHEILINUS TRILOBATUS Lacepede 



Plate 95,A,B 



Cheilinus trilohatus Lacepede, Histoire naturelle des poissons, vol. 3, pp. 529, 

 537, pi. 3, fig. 3, 1802 (type locality, Reunion, Mauritius, Madagascar). 



SPECIMENS STUDIED 



Bikini Atoll: 16 stations, 61 specimens, 22 to 193 mm. in standard length. 



Eniwetok Atoll: 3 stations, 7 specimens, 27 to 127 mm. 



Rongelap Atoll: 8 stations, 30 specimens, 17 to 182 mm. 



Rongerik Atoll: 3 stations, 9 specimens, 48 to 73 mm. 



Kwajalein Atoll: 1 station, 1 specimen, 16 mm. 



Likiep Atoll: 1 lot, Univ. Washington, 10 specimens, 33 to 131 mm. 



Guam: 3 lots, 11 specimens, 35 to 210 mm. 



Description. — Counts are recorded in table 98. 



Head 2.4 to 2.5; greatest depth 2.3 to 2.6; longest pectoral ray 5.0 

 to 5.7; snout tip to anus 1.6; snout to dorsal origin 2.1 to 2.3; all in 

 standard length. Snout 2.7 to 3.5; eye 4.0 to 6.8; postorbital length 

 of head 1.9 to 2.0, interorbital space (bony) 4.1 to 5.5; longest pectoral 

 fin ray 2.1 to 2.3; least depth of body 2.2 to 2.5; all in length of head. 

 Distance between anterior and posterior nasal openings 4 to 8 in 

 snout. Eye 0.9 to 1.6 in interorbital space. 



Body somewhat compressed ; snout normal, not elongated or tubular; 

 dorsal profile of head straight or shghtly concave, forming an angle 

 of 60 to 70 degrees with ventral contour of head; maxillary reaching 

 to a vertical hne through front of eye or rear nasal opening; maxillary 

 covered by preorbital; pectoral fin reaches to opposite seventh lateral 

 line scale; usually second branched pectoral ray from dorsal edge 

 longest; pelvics reach to anus on small specimens and far back of anus 

 on large adults; on large adults the soft rays of dorsal and anal fins 



