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



spot it is not distinct and is considered to be not sufficiently striking 

 to include any of our specimens from the Marianas in the species 

 eclipticus. 



POMACENTRUS JENKINSI Jordan and Evermann 



Plate 90,B 



Pomacentrus jenkinsi Jordan and Evermann, Bull. U. S. Fish. Comm., vol. 22, 



p. 189, 1902 (1903) (type locality, Honolulu). 

 Pomacentrus inornatus Schultz (Non De Vis) U. S. Nat. Mus. Bull. 180, p. 184, 



1943 (Swains Island; Samoa). 

 Pomacentrus atrilahiatus Fowler, Proc. Acad. Nat. Sci. Philadelphia, vol. 98, 



p. 146, figs. 15, 16, 1946 (type locality, Riu Kiu Islands). 



SPECIMENS STUDIED 



Bikini Atoll: 26 stations, 429 specimens, 17 to 90 mm. in standard length. 

 Enlwetok Atoll: 5 stations, 27 specimens, 15 to 78 mm. 

 Rongelap Atoll: 7 stations, 107 specimens, 23 to 77 mm. 

 Rongerik Atoll: 4 stations, 25 specimens, 30 to 83 mm. 

 Kwajalein Atoll: 4 specimens, 51 to 65 mm. 



Description. — ^Dorsal fm rays XIII, 15 to 17 (usually 16); anal rays 

 11,13 (rarely 14); pectoral ii,16 to 19 (usually 18); transverse scale 

 rows from upper edge of gill opening to base of caudal rays 28 or 29, 

 with 3K or 4 between lateral line and dorsal origin, 12 or 13 between 

 lateral line and anal origin; upper part of lateral line with 20 (rarely 

 21) tubular scales; gill rakers 7 to 9 + 1 + 12, totahng 20 to 22. 



Depth of body 1.8 to 2.0; length of head 3.1 to 3.3; both in standard 

 length. Snout 3.3 to 3.5; eye 2.9 to 3.6; preorbital width 6.7 to 8.9; 

 length of upper jaw 3.5 to 3.8; postorbital part of head (hind margin 

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

 2.9 to 3.5; depth of caudal peduncle 1.8 to 2.0; length of pectoral 

 fin 1.1 to 1.2, of pelvic fin 0.9 to 1.0, of 13th dorsal spine 1.6 to 2.1, 

 of upper caudal rays 0.8 to 0.9, of lower caudal rays 0.9 to 1,1; aU in 

 length of head (tip of snout to posterior margin of opercular mem- 

 brane). Depth of caudal peduncle in its length 0.9 to 1.0; angle of 

 snout profile with lengthwise axis of body 55 to 63 degrees. 



Teeth of jaws uniserial, truncate, even, close together; scales not 

 extending on snout anterior to nostrils; preorbital naked, suborbital 

 scaled and finely serrate; posterior margin of preopercle naked, ventral 

 margin of preopercle naked and entire, opercle scaled to edge, opercular 

 membrane narrow; dorsal spines gradually increasing in length to last; 

 soft dorsal and anal outlines angular; caudal shallowly forked, upper 

 lobe angular, lower rounded; pectorals angular, pelvics with 

 outer ray long and filamentous. 



Color in alcohol. — Dorsal part of head, back and sides dark reddish 

 brown; tip of snout blackish; posterior part of lips blacldsh, cheeks, 

 opercle, and breast light brown; scales of sides with pale centers. 



