270 BUL1.ETIN" 10 0;, UNITED STATES NATIONAL MUSEUM 



D. V, 28, 1 to 29, 1, first spine 1^ to 2^^ in head, first ray 2 to 2%; 

 A. II, 28, 1 to 29, I, second spine 2% to ?>}/2, first ray 3 to 3%; caudal 

 little emarginate, nearly truncate with age, length to tip of upper lobe 

 1 to 13^; least depth of caudal peduncle 43^ to b% ; pectoral 1 J/^ to 

 1%; ventral 1^ to 2}/i; 2 caudal bucklers, each with large keel, 

 front one larger and in adult 1^ in eye. 



Largely uniform brown. Iris brown. Dorsals and anals dusky 

 brown, each with submarginal deeper or more blackish band, edges 

 of rayed fins narrowly whitish; anal with 2 deep dusky longitudinal 

 bands besides border. Caudal deep brown, hind edge whitish, 

 broader in young in which it extends forward a little along upper and 

 lower edges. Pectoral rather deep brown, hind edge pale or whitish. 

 Ventral dusky terminally, paler basally. 



Red Sea, East Indies, Philippines, Melanesia, Micronesia, Polynesia. 



Distinguished from Naso unicornis by the lower front basal 

 edge of the rostrum falling close behind the front edge of the upper 

 jaw, so well shown in Giinther's figures. Our examples show a much 

 greater range in variation so we have given the accompanying figures 

 of the head. 



8631, 8632. Biri Channel.- June 1, 1909. Length 248 to 278 mm. 



9942. Biri Channel. June 2, 1909. Length 140 mm. 



7809, 7810, 7826, 7827. Bugsuk Island. January 5, 1909. Length 280 to 421 mm. 



22919. Busin Harbor, Burias Island. April 22, 1908. Length 62 mm. (D. 5640). 

 Anal with 5 or 6 dark longitudinal bands and both dorsals more or less uni- 

 color except paler blotches along base. Hind caudal portions broadly pale. 



7202. Cabugan, Hinunangan Bay, Leyte Island. July 30, 1909. Length 218 mm. 



5550. Cataingan. April 19, 1908. Length 195 mm. 



7744. Caxisigan Island, near Balabac. January 2, 1909. Vertical fins blackish 

 at tips, extreme margin white. Dorsal without bars. Anal with 3 or 4 slightly 

 oblique bars. Length 282 mm. 



(1843, 1844.] Cebu market. August 28, 1908. Length 123 to 127 mm. Two 

 examples. 



6365. Jolo, Jolo Island. March 7, 1908. Length 165 mm. 



4795, 4796. Jolo market. February 8, 1908. Hair-brown generally, slightly 

 darker on back and shading to dirty mottling on white below. Dorsal darker 

 marginally, extreme tip with narrow white line, almost black sub margin ally. 

 Anal sage green, with 3 darker irregular bands, broadest near margin and edge 

 of fin narrowly white. Caudal like body, darker terminally, white edge 

 broadens at tips of lobes. Pectoral darker on inner surface and terminally, 

 tip hyaline, ventral membrane dark, rays light. Length 303 to 397 mm. 



5975, 9825. Little Santa Cruz, Zamboanga. May 26, 1908. Length 185 to 

 203 mm. 



9080. Malhon Island. July 27, 1909. Length 320 mm. 



Eight examples. Pandanon Island. March 24, 1909. Caudal broadly and 

 dorsal and anal more narrowly white edged. Length 50 to 68 mm. 



22190. Pangasinan Island. February 13, 1908. Length 116 mm. 



7797. Port San Pio Quinto, Camiguin Island. November 10, 1908. Length 

 295 mm. 



8950. Between Paron and Jesus Points, Luzon. June 2, 1908. Length 346 mm 



7699. Ulugan Bay near Rita Island. December 29, 1908. Length 428 mm. 



