250 
BULLETIN OF THE UNITED STATES FISH COMMISSION. 
207. Chsetodon bricei H. M. Smith. “Mariposa” ; Butterfly. 
Head 2.5; depth 1.7; eye 2.8; snout 3.2; interobital 3; D. xm, 20; A. in, 17; pectoral 1.4; ventral 
1.2; caudal 1.4; scales 6-40-17. Close to C. capistratus, but with 2 ocelli, the larger one, on body under 
soft dorsal, rather elliptical in shape, the smaller one, size of eye, directly above the larger, on anterior 
rays of soft dorsal ; the brown band from spinous dorsal across body is deeper in color and its edges 
are more sharply defined than in C. capistratus, and the broad posterior brown band of body is rela- 
tively larger and more distinct, extending from soft dorsal to anal and involving both ocelli. 
One example only in the collection, 1.25 inches in length, collected at Fajardo. Hitherto known 
only from Woods Hole, Mass., where 6 specimens were taken in 1897 and 42 in September, 1899, by 
the author of the species. 
Chsetodon bricei H. M. Smith, Bull. U. S. F. C. 1897, 102, Woods Hole, Mass.; Jordan & Evermann, 1. c., 1678, 1S98. 
Fig. 69 . — Pomacanthus arcuatus. 
Genus 114. POMACANTHUS Lacepede. Chirivitas. 
Body much compressed and elevated, covered with small scales, among which smaller ones are 
distributed so that the series are not distinct; preopercle with a very strong spine at its angle, vertical 
limb entire in adult, usually serrulate in young; interopercle entire or nearly so; dorsal fin entirely 
scaly, with 8 to 11 graduated spines; soft dorsal usually much elevated in front; anal with 3 graduated 
spines; branchiostegals 6; air-bladder with 2 posterior horns; pyloric caeca numerous. 
Found in the tropical seas; fewspec.ies, chiefly American; the young brilliantly colored, the adult 
usually dull-colored. The species vary greatly with age and have been almost inextricably confused, 
as the age variations are much more striking than the specific distinctions. The number of dorsal 
spines is usually diagnostic. 
a. Dorsal spines vm to x, 29 to 32. 
b. Scales in lateral line about 50 to 55; dorsal Till or ix, 30 to 32; A. Ill, 24. Color of adult steel-gray or scarcely 
yellowish; young with 4 whitish crossbands arcuatus, 208 
bb. Scales in lateral line 70 to 90; dorsal usually x, 29 or 30; anal in, 23 or 24. Color black in adult, with yellow 
mottlings; base of pectoral yellow; young with several yellowish crossbands paru 
