I02 Dircnor s Anmial Report. 



178. Chsetodon trifasciatis Quoy & Gaim. 



Head 3; depth 1.75; eN'e 3.50, i into snout; interorbital 2.75; 

 D. XIV 17; A. IV 16; \ . I 5. Scales 9-37-14. Bod}- moderately 

 elevated and strongly compressed. The snout rather sharp-pointed. 

 Lower edge of pre.opercle serrated. Branchiostegals 6. Teeth 

 setiform. The dorsal spines are of moderate strength, the longest 

 spine 1 .75 into head. Pedlorals and ventrals of about equal length, 

 1.60 into head. Color in spirits: Yellowish white, wdth about 15 

 rather indistinct oblique dusky lines, angularly bent, with the 

 angle directed forward. The black ocular band edged wdth white 

 of about the same width as eye, extends from the neck to chest, 

 forming a complete ring. A black band, slightly wider than eye, 

 covers all the soft dorsal and extends down to posterior part of soft 

 anal; this band is anteriorly margined with white. The fins are 

 white, the caudal with a wash of yellow, a narrow black line near 

 the middle. Only one specimen, 2 inches in length, was taken. 

 Guam, July 14, 1900. This species is well figured in Freycinet, 

 "Voy. Uranie." Zool., PL 62, Fig. 6. Hab. Polynesia, Marianas. 



Genus HBNIOCHUS Cuvikr & Valenciennes. 



179-180. Heniochus chrysostoma (Solander). 



Head 3; depth 1.40; D. xii 23; A. 11 18; eye 2.75. Scales 

 small, about 67 in the curved lateral line. Fins: Dorsal with fourth 

 spine elongated into a filament almost as long as depth of fish. 

 Pe(5torals white, reaching to middle of black band on bod}'. Ven- 

 trals black, reaching to base of anal. Caudal square, white with 

 dusky spot at base. Soft dorsal white, soft anal mostly black. The 

 snout is short and sharp-pointed, mouth small, teeth villiform in 

 jaws. Color: Yellowish wdiite, with three broad oblique bands of 

 black. The first black band extends from the front of orbit and 

 near first dorsal spine, obliquely down to base of ventral fins and 

 near to anus; the second black band extends from the 3-7 dorsal 

 spines to third and the last soft ra3'S of anal; the third black band 

 extends from about the ninth dorsal spine along the base of soft 

 dorsal to the base of caudal. Snout dusky. Length 3.50 inches. 

 Several specimens were taken inside the coral reef, near Agana, 

 Guam, July, 1900. Hab. Indian Archipelago, Polynesia, Marianas. 



Family ^ANCLID^.— Moorish Idols. 



Genus ^ANClvUS Cuvier & Valenciennes. 



181-188. ^anclus canescens (Linn.). Ababang. 

 Butterfly-fish. 



Head 2.45; depth about the same as length; eye 2.50 into snout; 

 D. VII 37; A. Ill 35. A frontal horn above each orbit in adult 

 specimens. Snout produced, teeth slender and brush-like, much 



