Report of a Mission to Guam. 99 



spinous dorsal tlirough eye to isthmus. Tip of snout black. Fins: 

 Anal tipped with a black band, almost as wide as ocular band. 

 This black band on anal is edged inwardly with a bright yellow 

 band of about equal width. Pedlorals, ventrals, caudal and dorsal 

 wliite, the dorsal narrowly edged with dusky. The dorsal and anal 

 forming an acute angle posteriorly. A series of four specimens 

 were secured inside the coral reef, Agaiia, Guam, July 9, 1900. 

 These range in length from 3-3.75 inches. Hab. Polynesia, Mo- 

 lucca Sea, Marianas. 



173. Chsetodon collaris Bl. 



Head 3.50; depth 1.20; eye 2.75 into head; snout obtuse, about 

 ecjual in length to diameter of eye; preopercle slightly serrated; 

 D. XII 26; A. Ill 21. Scales 5-45-22. Fins: The peclorals and 

 spinous dorsal are white; the ventrals and anal are black; the cau- 

 dal is white with two black lines and one yellow line near the end; 

 the dorsal is grayish with a bright yellow line near edge of soft 

 dorsal — this fin also has a minute subterminal line of black. The 

 posterior part of dorsal and anal are sharply rounded, the general 

 outline forming an acute angle. The caudal peduncle is black. 

 Color in spirits: The general color is a blackish olive with irreg- 

 ular rows of longitudinal or oblique lines of yellowish round dots 

 showing through each scale. This coloring extends from the black 

 belly and anal fin up to the lateral line. In the specimen before 

 me the lateral line is made ver}- conspicuous by having five or six 

 rows of the round yellow dots running parallel with it. It is very 

 noticeable that these color dots are not so bright a yellow on 

 the upper half as on the lower part of the body; the fading, how- 

 ever, is gradual. There is a broad black ocular band wider than 

 the eye and edged with bright yellow, except on upper third; this 

 black band extends to and embraces the ventrals. All the front 

 part of head is black or dark brown, wath a bright yellow line which 

 forms the anterior border of ocular band, extending verticallv down 

 from the front edge of one orbit, under chin, to the other orbit. 

 The interorbital space is slightly lighter brown and is indistin(5lly 

 surrounded by pale yellowish lines, the upper one of which forms 

 the upper anterior border of the black ocular band. From base of 

 pecftorals to base of ventrals and forw^ard to ocular band there is a 

 bright yellow area; above this and just back of ocular band there 

 is a grayish area or band wider than the ocular band. This gray- 

 ish color embraces all the dorsal fin and extends down to the lateral 

 line. Variations: In the "Fische d. vSud.see" this species is figured 

 as having the grayish coloring extending more than half-way down 

 the sides with an abrupt whitish line (gray area in my specimen) 

 between this color and the ocular band. In "Fishes of India" this 

 species is figured with a narrow "bluish white" band just posterior 

 of ocular band, and all the color dots run in a marked oblique 



