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



predorsal scales 3 to 9; abdominal vertebrae 10 to 12, and caudal 

 vertebrae 13 to 15, always totaling 25. 



Genus CHLORURUS Swainson 



Chlorurus Swainson, Natural history and classifications of fishes . . ., vol. 2, p. 

 227, fig. 61, 1839 (monotypic, Scarus gibbus Riippell; also as Chloregaster 

 Swainson on p. 172 with no species listed and under the subfamily Labrinae 

 as Chlorurus with no species listed, also another error) . 



CHLORURUS BICOLOR (Riippell) 



Plates 108,A; 109,A 



Scarus bicolor RCppell, Atlas zu der Reise im Nordlichen Afrika . . . Fische des 

 rothen Meers, p. 82, pi. 21, 1828 (type locahty, Djedda). 

 SPECIMENS STUDIED 

 Bikini Atoll: 6 stations, 9 specimens, 127 to 270 mm. in standard length; 1 lot, 

 Univ. Washington, 1 specimen, 200 mm. 



Rongerik Atoll: 1 station, 1 specimen, 40 mm. 

 Rongelap Atoll: 4 stations, 4 specimens, 26 to 435 mm. 

 Arno Atoll: 1 lot, 1 specimen 98 mm. 

 Likiep Atoll: 1 lot, Univ. Washington, 1 specimen, 55 mm. 



Ecology. — The juveniles of this species occurred occasionally in the 

 shallow tidal zone of the reefs, whereas the adults were taken below the 

 low tidal level. At no time did this species appear to be an abundant 

 inhabitant of the reefs. 



Remarks. — This species is characteristically colored at all sizes. 

 The young have a dark ocellate spot at the front part of the dorsal fin 

 and the larger fishes have black spots on the lower scales of the body. 

 The median predorsal scales number 6 or 7 ; there are 3 rows of scales 

 on the cheek, with 4 to 8 scales in the ventral (third) row; and there 

 are usually ii,12 pectoral fin rays. 



CHLORURUS PULCHELLUS (Ruppell) 



Plates 108,B; 109,B 



Scarus pulchellus RtJppELL, Neue Wirbelthiere zu der Fauna von Abysinnien 

 gehorig, Fische p. 25, pi. 8, fig. 3, 1835 (type locality, Red Sea). 

 SPECIMENS STUDIED 

 Bikini Atoll: Lagoon, 4 miles Southwest of Bikini Island, July 11, 1946, S-46-247, 

 1 specimen, 375 mm. 



One large specimen taken at Enyu Island in 1946, was photographed but not 

 preserved. 



Rongelap Atoll: Tufa Island, July 18, 1946, 1 specimen, 355 mm. 



Ecology. — This characteristic species was never seen over the inter- 

 tidel zone of the reef, but it did occur in the deeper waters of the 

 lagoon and along the deeper waters of the ocean side of the reefs. The 

 smallest specimen seen by me was about a foot long. 



