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



since it meets its fellow on under side of lower jaw; two dark spots on 

 dorsal surface of head between nasal openings. 



The following variation in color connects the juvenile color pattern 

 with that of the adults, (all measurements of length refer to the 

 standard length): At lengths of 26.5, 27, 34, 42, 45, 47, 49, 50, 55, 

 57, and 59 mm. the dark ocellate spot in the soft dorsal fin on the 

 first 4 or 5 rays is distinct, whereas at lengths of 57, 67, 70, and 73 

 mm. this ocellate spot has almost blended into the adult color pattern 

 (round whitish areas surrounded by dusky pigment) of the dorsal fin. 

 The three blackish bars are distinct (middle one contains the dark 

 ocellate spot) at lengths of 16, 26.5, 27, 34, 42, 45, and 50 mm. At 

 lengths of 42, 45, and 50 mm., the dark bars are becoming less distinct 

 and the dark spots on the scales are beginning to form. The black 

 spots on the scales are well formed at lengths of 47, 49, 50, 55, 57, and 

 59 mm., and on all larger specimens; at these sizes the round whitish 

 spots on dorsal fin are distinct. A black spot at base of first dorsal 

 spine is distinct at lengths of 42, 45, and 55 mm. There are black 

 spots or blotches at base of each pelvic fin, on ventral side of body in 

 front of anus, at front of soft rays of anal fin, and at ventral side of 

 caudal peduncle just behind rear of anal fin base at lengths of 26.5, 

 27, 34, and 42 mm. The second white area on back next to base of 

 dorsal fin begins to appear at lengths of 50, 55, 58, 59, and 60 mm. 

 The third white one at dorsal edge of caudal peduncle just behind 

 rear of dorsal fin base appeared faintly at lengths of 55, 73, and 80 

 mm. The brown stripes on the head characteristic of the young, 

 were changing into whitish streaks at lengths of from 60 to 75 mm. 



Color when alive. — Background color of body whitish; dorsal, caudal, 

 anal, and pelvic fins golden yellow; 3 fight areas along back, yellow; 

 light round spots on dorsal fin yellow; base of pectoral yellow; light 

 spots on body in front of dorsal origin and above pectoral fin, pinkish 

 to orange; light streaks on head pinkish bordered with purpUsh; 

 lower part of head yellowish; dark spots on scales purplish-black; eye 

 orange; dark pectoral spot purpHsh black or dark blue; dark spot in 

 axil of pectoral base brownish red. 



Ecology. — This species was common in the intertidal zone of the 

 reef where ample growths of corals and algae occurred, and it occurred 

 in lagoon to depths of at least 30 feet. 



Remarks. — There occurred in the series of specimens of this species 

 collected in the tropical Indo-Pacific Oceans sizes intermediate 

 between the adults recognized as H. centriquadrus (Lacepede) by 

 authors, and the juveniles recognized as H. notophthalmus (Bleeker). 

 The specimens to which I refer are the "young" described under 

 "Color in alcohol." They show a complete color pattern change 

 from the dark barred pattern of notophthalmus to that of the 



