122 U.S. NATIONAL MUSEUM BULLETIN 2 02 Vol. 3 



16. Dorsal rays i,8 or 9; anal rays i,8 (rarely i,7). 

 3o. Dorsal rays i,8. 



4a. Caudal fin with dark-bordered light spots arranged in slightly irregular 

 tran verse bars; head and body with small evenly spaced dark- 

 bordered light spots, some with dark centers; spots along lower 

 cheeks ending ventrally in a clean even line along chin and throat; 

 dark, ocellated spot usually present at base of dorsal. 



C. solandri (Richardson) 



4b. Caudal fin without spots; rays dusky yellowish, membranes pale or 



dusky; head and body with round pale spots, none with borders 



darker than ground color; ground color forming a network of lines 



on lower sides, this network disappearing antero ventrally, 



5a. Dark ocellate spot present just below base of dorsal fin, sometimes 



a light dot or dash present in center of dark spot; pale streaks 



crossing snout in front of eye C. janthinopterus 29 (Bleeker) 



5b. No single ocellate spot just below base of dorsal fin ; instead, irregularly 

 shaped white spots like those on back and sides; pale streaks if 

 present not crossing snout and meeting their fellows on mid- 

 dorsal line; snout usually with dusky spots, probably blue when 



alive C. jactator (Jenkins) 



35. Dorsal rays i,9; back and upper sides of body brown, lower sides and 

 belly abruptly pale yellowish brown; head, back, and sides with 

 numerous tiny pale spots; dark brown oblong spot at base of dorsal 

 fin outlined by broken oblong blue spots; upper part of caudal 

 peduncle with two indistinct dark bars (sometimes broken) meeting 

 on middorsal surface of caudal peduncle, the points of these bars 

 directed posteriorly; eye with radiating blue lines, none meeting 

 those from opposite side over snout or interorbital ; 2 or 3 broken 

 vertical lines on cheek just posterior to corner of mouth; a narrow 

 blue mid- ventral line extending from chin to vent; caudal fin rays 

 yellowish; membranes hyaline C. bennetti (Bleeker) 



CANTHIGASTER AMBOINENSUS (Bleeker) 



Plate 142,D 



Psilonotus amboinensis Bleeker, Nederl.-Tijdschr. Dierk., vol. 2, p. 180, 1865 

 (type locality, Amboina). 



SPECIMENS STUDIED 



Bikini Atoll: 2 stations, 2 specimens, 54 to 61 mm. in standard length. 

 Eniwetok Atoll: 2 stations, 6 specimens, 75 to 86 mm. 

 Guam: 2 lots, 4 specimens, 22 to 50 mm. 



Description. — Dorsal rays i,ll; anal i,10; pectoral rays ii,15; 

 branched caudal rays 3+4; gill rakers 8 to 10 (usually 9) on anterior 

 side of first gill arch. 



Depth of body 1.9 to 2.2; width of body at pectorals 3.0 to 4.2; 

 length of head 2.4 to 2.7; length of caudal fin 3.1 to 3.6; all in standard 

 length. Snout 1.4 to 1.6; diameter of eye 3.3 to 4.9; least depth of 



29 We identify as tbls species one of the specimens from Rose Island (USNM 115295), reported on by 

 Schultz (U.S. Nat. Mus. Bull. 180, p. 295, 1943) as C. solandri. 



