76 BULLETIN 10 0, UNITED STATES NATIONAL MUSEUM 



Chaetodon spilopleura (Reinwardt) Cuvier, Hist. Nat. Poiss., vol. 7, 1831, 



p. 74. Moluccas. 

 Chaetodon zanzibarensis Playfair, Fishes of Zanzibar, 1865, p. 33, pi. 6, fig. 1. 



Zanzibar. — Pfeffer, Jahrb. Hamburg. Wiss. Anstalt., vol. 6, 1889, p. 22 



(Zanzibar). 

 Chaetodon unijasciatus (not Gronow) (Van Hasselt) Bleeker, Verh. kon. 



Akad. Wet. Amsterdam (Rev. Chaetodon.), vol. 17, 1877, p. 63 (name in 



synonymy). 



Depth 13^ to 1%; head 3 to 3K, width \% to 2. Snout 3)^ to 

 3% in head; eye 2% to 3%, greater than snout in young to IJ/g with 

 age, little greater than interorbital in young to IJ^ in interorbital 

 with age; maxillary ^ to ^ in snout, 33^ to 4 in head; interorbital 

 2% to 2^, broadly convex. Gill rakers 5 + 10, short pomts, 3^ of 

 gill filaments, which equal eye. 



Scales 42 to 44 between gill-opening and caudal base; tubes 35 to 

 17 in lateral line; 12 scales above lateral line, 19 or 20 below. Scales 

 with 1 to 9 basal radiating striae, largely absent with age; apical 

 denticles 56 to 135, with 7 to 9 series of transverse basal elements. 



D. XIV, 17, I or 18, i, last spine 13^ to 1% in head, seventh ray 

 13^ to 1%; A. Ill, 16, I, third spine \% to V/^, seventh ray 13^ to 

 33^; least depth of caudal peduncle 23^ to 3; caudal 1% to \%, hind 

 edge slightly convex ; pectoral 1 ^o to 13^; ventral 13^ to 13^. 



Light brown generally. Black band from supraoccipital region to 

 eye, which it crosses, down over cheek and front of chest where also 

 meeting its fellow diffusely. Large blackish blotch on side of back 

 equal to anal fin length in extent, long as head in young. Caudal 

 with broad pale posterior edge, in young hind half of fin pale. 



Zanzibar, Seychelles, East Indies. Coloration constant and with 

 little variation even due to age. One example (1182) differs in that 

 a narrow brown line extends from snout tip to dorsal and along chin 

 medianly. 



8673. Biri Channel. June 2, 1909. Length 122 mm. 



1182, 1539. Bolalo Bay. March 10, 1909. Length 145 mm. 



1099. Bugsuk Island. January 5, 1909. Length 86 mm. 



778 to 780. Jolo. March 6, 1908. Length 75 to 94 mm. 



A405. Jolo Market. March 7, 1908. Length 141 mm. 



140 and 431. Langao Point, Luzon. June 24, 1909. Length 95 to 126 mm. 



1116, 6028 to 6029, 6031. Little Santa Cruz Island. May 28, 1908. Length 



136 to 160 mm. 

 369. Malapascua Island. March 16, 1909. Length 111 mm. 

 400 and 401. Matnog Bay. May 31, 1909. Length 124 to 143 mm. 

 6279. Medio Island, Galera Bay, Mindoro. June 9, 1908. Length 140 mm. 

 605 and 1092. Murcielagos Bay. August 9, 1909. Length 110 to 115 mm. 

 4725, 4744. Pilas Island. September 12, 1909. Length 67 to 97 mm. 

 629. Port Banalacan, Marinduque. February 23, 1909. Length 120 mm. 

 46. Port Langcan, Palawan Island. April 8, 1909. Length 123 mm. 

 10480, 10494. Port Maricaban. July 21, 1908. Length 128 to 130 mm. 



