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U.S. NATIONAL MUSEUM BULLETIN 2 02 



Vol. 2 



the body the dark coloring ending at the sixth or seventh dorsal 

 spine and anus, the rest of the body and fins back of this Hne are 

 pale yellowish white. C. iomelas has dorsal fin rays XII, 13 ; anal 11,13 ; 

 pectoral ii,15. C. leucurus is dark brown almost to tip of caudal 

 peduncle; the dorsal and anal fins are entirely dark except for the 

 tips of the last 6 rays. 



Figure 91.— Chromis leucurus Gilbert, USNM 141157 from Rongelap Atoll. Drawn by 



A. M. Awl. 



CHROMIS LEUCURUS Gilbert 



Figure 91; Plate 84, A 



Chromis leucurus Gilbert, Bull. U. S. Fish Comm., vol. 23 (1902), pt. 2, p. 620, 

 pi. 77, fig. 2 (1905) (type locality, Avone Channel off Kauai, Hawaiian Islands, 

 holotype studied). 



SPECIMENS STUDIED 

 Bikini Atoll: 3 stations, 25 specimens, 31 to 61 mm. in standard length. 

 Rongelap Atoll: 1 station, 5 specimens, 36 to 43 mm. 

 In addition 2 specimens from Johnston Island were studied. 



Description. — Dorsal fin rays XII, 13; anal 11,12 to 14; pectoral 

 ii,14 or 15; transverse scale rows from upper edge of gill opening to 

 base of caudal rays, 25 to 27, with 3 or 3K between lateral line and 

 dorsal origin, 9 or 10 between lateral line and origin of anal; upper 

 part of lateral line with 15 or 16 tubular scales; gill rakers 8 or 

 9 + 1+21 or 22, totaling 31 or 32 (4 counts). 



Depth of body 1.7 to 2.0; length of head 3.2 to 3.4; both in standard 

 length. Snout 3.8 to 4.7; eye 2.4 to 2.9; preorbital width 9.6 to 10.9; 

 length of upper jaw 3.0 to 3.1; postorbital part of head (hind margin 

 of eye to upper edge of gill opening) 2.4 to 2.6; interorbital width 2.5 



