FISHES OF THE PHH-IPPINE AND ADJACENT SEAS 22S 



body; least depth of caudal peduncle 2^ to 2^^ in head; pectoral 1 

 to IK; ventral 1 to IM; caudal spine 2?/^ to 5. 



Largely dull chocolate to umber brown, with more or less dull uni- 

 form tinge. Many fine dark or dusky longitudinal parallel lines on 

 head and body. Sometimes a pale ill-defined interocular band. 

 Edge of opercle or gill opening sometimes narrowly dark. Iris yel- 

 lowish brown. Caudal spine often with groove dusky to blackish. 

 Dorsals, anals and caudal largely dusky brown, former two fins with 

 narrow blue border and also narrow basal line to same of each basally. 

 Base of caudal with pale whitish transverse band, variously distinct, 

 often not evident. Sometimes caudal with traces of dark spots. 

 Paired fins uniformly brown, variously dark to dusky. 



Red Sea, Mauritius, Madagascar, East Indies, Philippines, Riu Kiu, 

 Japan, Micronesia, Polynesia, Hawaii. 



This species was supposed to differ from the nominal Acanthurus 

 dussumieri in the black postocular spot and the dark lines on the 

 cheek reticulated besides a few dark submarginal Imes on the dorsals 

 and anals. It is allied with Hepatus nigrojuscus in the pale trans- 

 verse basal caudal band, but differs, as above, the postocular blotch 

 not extending over on the suprascapula. Moreover it resembles 

 Acanthurus dussumieri in the blue line at both bases of dorsal and anal. 



7805. Bugsuk Island. January 5, 1909. Length 230 mm. 



8796. Butauanan Island. June 12, 1909. Length 277 mm. 



7795. Candaraman Island, Balabac. January 4, 1909. Length 38S mm. 

 General color brownish. Several orange red lines before eye. Fins more or 

 less brownish like body. Dorsals and anals with numerous narrow black- 

 blue lines or bars posteriorly; outer margins of fins blue. Caudal margin 

 within fork blue, outer edge white. Pectoral tip yellowish. 



8994. Gubat Bay. June 23, 1909. Length 235 mm. 



8810, 8811. Maculabo Island. June 13, 1909. Length 263 to 375 mm. 



884o'. Maculabo Island. June 14, 1909. Length 283 mm. 



8368. Malapascua Island. March 16, 1909. Length 408 mm. Purplish brown, 

 with dull slate stripes on side of head, little distinct. Yellowish about eye, 

 most conspicuous behind eye and above corner of giU opening where obscurely 

 bordered with dusky purple. Body without stripes or lines. Dorsals and 

 anals with narrow purplish borders and many purplish bars, best seen as fin 

 is held against light. Caudal rays purplish, bright terminally, and margin of 

 fin in fork pale but not white. Caudal spine with black socket. Pectoral 

 dusky olive, somewhat purplish on outer surface without distinct color 

 divisions. Ventral dusky olive. 



6164. Mansalay, Mindoro Island. June 4, 1908. Length 308 mm. 



8596. Matnog Bay. May 31, 1909. Length 213 mm. 



9285 to 9287. Murcielagos Bay. August 9, 1909. Length 295 to 355 mm. 



8212. Pagapas Bay, Luzon. February 20, 1909. Length 437 mm. 



7043. Port San Pio Quinto, Camiguin Island. November 11, 1908. Length 

 330 mm. General color brown, on fading centers of scales on back and sides 

 becoming more or less brassy. On upper side and back numerous narrow 

 slaty blue lines. Head similar to body, only slightly darker. Cheek with 

 numerous small lighter spots, nearly umber. Black-centered, blue-rimmed 



