144 BULLETIN 18 0, UNITED STATES NATIONAL MUSEUM 



marginal wide black band or patch occupying outer 

 V2 or % of fin, below this a white line that borders 

 another black band in basal % of fin, white on dorsal 

 side of black band extending forward to anus ; white 

 margin on soft dorsal, tips of rays tinged with 

 blackish, a submarginal black line, then a white 

 band followed by a diffuse black line, then in basal 

 one-third of fin a wide black band extending on 

 upper part of caudal peduncle bordered anteriorly 

 with white ; margin of caudal fin pale, then a sub- 

 marginal wide transverse black band crosses the 

 middle of the fin, this band white bordered ; dorsal 

 rays XIII or XIV, 19 to 23; anal III, 19 or 20, 

 scales 38 to 44_ Chaetodon trif asciatus Mungo Park 

 166. Width of blackish-brown band as it passes through 

 eye much wider than eye so that nearly half of color 

 band is behind the eye, this black band extending 

 from occiput to isthmus and partially or completely 

 interrupted on front of head above eye by a triangular 

 whitish area ; a large crescent-shaped patch from base 

 of soft dorsal and last dorsal spines to posterior 

 half of base of soft anal, gradually narrowing toward 

 anal, this patch extending on base of caudal peduncle ; 

 from base of dorsal spines and base of crescent- 

 shaped patch about 20 dark lines, following vertical 

 series of scales running downward to below level of 

 pectorals; ventral posterior margin of anal with 

 diffuse blackish line, rest of fin pale; margin of 

 caudal hyaline with a black submarginal line; soft 

 dorsal pale; dorsal rays XII, 24 to 27; anal III, 20 

 or 21, scales about 20 to 22. 



Chaetodon lineolatus Cuvier 



10&. Black band that passes from supraorbital region through eye 



and often continuing below it does not reach isthmus or breast, 



always ending above or on branchiostegal membranes. 



18a. Caudal peduncle with a black spot dorsally or ventrally or 



with a black ring or saddle. 



19a. One or two black lines or bands across caudal fin, posterior 



margin of fin always pale or hyaline. 



20a. Anal fin with a wide black band on its margin ; spines 



and soft rays of dorsal with black marginal band as 



on anal fin ; from in front of spiny dorsal along its base 



to sixth or seventh spine is a white-bordered (yellow 



in life) black band that then passes downward and 



forward to above pectoral base, widening downward and 



abruptly ending just at back of head where its width 



is one-half head, this black blotch with a central light 



area below front of spiny dorsal ; near base of soft 



dorsal is a white-bordered black crescent-shaped band 



increasing in width to caudal peduncle, where it ends 



as a black spot not meeting its fellow below ; 35-mm. 



specimens have two ocellatcd spots, one on soft dorsal 



and the other on caudal peduncle, and black patch above 



pectoral not yet wedge-shaped ; black band that passes 



