176 BULLETIN 180, UNITED STATES NATIONAL MUSEUM 



same strength as ou opercle ; teeth in one row in both jaws, short and 

 conic, with evident space between Ihem at fi'ont of jaw ; preopercle, 

 preorbital, and suborbitals with small spines; dorsal rays X, 17; anal II, 

 14 ; scales about 52 ; pectoral about 18 ; gill rakers about 5 + 12 ; a pale 

 dark bordered band from front of dorsal across opercular apparatus 

 just touching rear of eye and ending on subopercle ; caudal fin and caudal 

 peduncle pale ; a wide blackish or brown band from dorsal to anal fin 

 leaving anterior lower part of body pale ; pelvic and anal fins blackish ; 



pectoral pale Amphiprion melanopus Bleeker 



lb. Scales fewer than 40 ; spines on opercle, if present, not appearing as if 

 radiating from a common center but occurring as denticles along posterior 

 margin. 

 2a. Teeth at front of jaw in two series, an outer row of short conical canines, 

 rather widely spaced, inside of which is a narrow band of villiform 

 teeth or an irregular series of small teeth. 

 3a. Preopercle serrated ; caudal, soft dorsal, and anal fins scaled about two- 

 thirds of the way out from bases; suborbitals free with denticles; 

 preorbitals fully scaled ; snout in front of nostrils with scales. 

 4a. Small denticles on suborbitals and preopercular, opercular, and inter- 

 opercular margins ; color consists of three vertical black bands one 

 from front of dorsal through eye to mouth and on chin, the 

 interorbital and lips pale; second from middle of base of spiny 

 dorsal through pectoral base to pelvics; third from soft dorsal to 

 soft anal ; margin of dorsal blackish ; pelvics blackish, caudal 



peduncle and fin pale Dascyllus aruanus (Linnaeus) 



46, Preopercle and suborbitals with very fine denticles, opercle smooth ; 

 color in alcohol plain brown with a pale area at and a little above 

 • lateral line under 8 to 10 dorsal spines ; anal, pelvics, and caudal 



fins somewhat blackish distally; spinous dorsal with margin black- 

 ish; black spot at upper edge of pectoral base; dorsal rays XII, 

 15; anal II, 14; pectoral about 20; scales 27; gill rakers 7 4-17. 



Dascyllus trimaculatus (Riippell) 

 36. Preopercle smooth; opercle and interopercle smooth; free edge of sub- 

 orbitals absent or obscure, at most poorly defined, and without 

 denticles ; caudal fin scaled ; preorbital scaled. 

 5a. No scales on soft dorsal or anal fins ; snout in front of nostrils scaled ; 

 color in alcohol mostly plain grayish (in life bright blue), with a 

 stripe from snout to eye; outer rays of caudal fin with blackish 

 pigment, middle of fin pale ; other fins plain pale ; on lower sides of 

 some specimens are pale areas, somewhat V-shaped but rather 

 obscure markings ; anal opening pale ; peritoneum blackish ; upper 

 edge of pectoral base blackish; dorsal rays XII, 9 to 11 (usually 

 10); anal II, 9 or 10 (usually 10); scales about 25 or 26; giU 

 rakers 8 to 10 + 22 to 24 ; color of a specimen in life (field No. 

 U-39-520) body above brilliant bluish with purplish iridescent 

 shade, darker above, paler below ; base of pectoral blackish ; upper 

 and lower rays of caudal blackish; eye light bluish, margin of 



pupil yellow-orange Chromis caeruleus (Guvier) 



56. Scales about two-thirds way out on soft dorsal and anal fins; snout 

 scaled a little beyond nostrils; color in alcohol, posterior half of 

 body and fins pale, anterior half plain brownish ; pelvic fins brown- 

 ish ; pectorals pale; base of pectoral blackish or brown; dorsal rays 

 XII, 13; anal II, 13 Chromis dimidiatus (Klunzinger) 



