100 



BULLETIN 10 0, UNITED STATES NATIONAL MUSEUM 



1^; least depth of caudal peduncle 3i^ to 3%; caudal 1^ to 1^, 

 hind edge broadly convex; pectoral l^i to \}/^; ventral 13^ to 1%. 



Light brown, little paler on lower surface of head, breast, abdomen. 

 Broad black blotch from above eye, slightly wider than eye, down and 

 over cheek and lower side of head, but not on chest. Small variable 

 occipital saddle-like black blotch. On each row of scales on body 

 diffuse deep band narrowing above and below, all sloping obliquely 

 up and back and above lost in darker brownish at bases of dorsals. 

 Dorsals marginally deep brown, with submarginal pale line. Soft 

 anal similar. Caudal with pale posterior margin, then broad deep 

 brown submarginal transverse band and before parallel pale diffuse 

 band; base of fin deep brown. Paired fins dull brown. 



Greatly resembles Chaetodon lunula but without the dark markings 



Fig. 6. — Variation of Color Markings of Chaetodon adiergastos Seale 



on the back along the bases of the dorsals and caudal peduncle. In 

 the young the black blotch is present in the postero-median dorsal 

 rays over their outer portion and but little smaller than eye. Also 

 its caudal with terminal half pale. 



1322,8171,8172. Alibijaban Island, Ragay Gulf. March 6, 1909. Length 130 



to 141 mm. 

 1058 and 8114. Alimango Bay, Burias Island. March 5, 1909. Length 138 to 



143 mm. 

 8933. Atulayan Island, Lagonoy Gulf. June 18, 1908. Length 164 mm. 

 8348. Buang Bay, Talajit Island. March 15, 1909. Length 157 mm. 

 767. Busin Harbor, Burias Island. March 7, 1909. Length 105 mm. 

 923,1031,1155,5678. Busin Harbor. April 23, 1908. Length 105 to 137 mm. 

 8033. Capulaan. February 24, 1909. Length 148 mm. 



4785. Canmahala Bay, Ragay Gulf, Luzon. March 11, 1909. Length 67 mm. 

 7723, 7752, 7754. Caxisigan Island, Balabac. January 2, 1909. Length 143 to 



152 mm. 



