146 BULLETIN TOO, UNITED STATES NATIONAL MUSEUM 



VINCULUM SEXFASCIATUS (Richardson) 



Chaetodon tiexjasciatus Richardson, Ann. Mag. Nat. Hist., London, vol. 10, 

 1842, p. 26. West Australia. — Gunther, Cat. Fish. Brit. Mas., vol. 2, 

 1860, p. 35 (type). — Klunzinger, Sitz. Ber. Akad. Wiss. Wicn, vol. 60, 

 abth. 1, 1879, p. 360 (King George Sound). 



Vinculum sexfasciatum McCulloch, Biol. Res. Endeavour, vol. 2, pt. 2, 1914, 

 p. 110, pi. 22 (Doubtful Island Bay, West Australia); Austral. Zoologist, 

 vol. 2, pt. 3, 1922, p. 91, pi. 27 (New South Wales).— Ahl, Arch. Naturg., 

 vol. 89, abth. A, Heft 5, 1923, p. 21 (Southwest Australia). 



Chaetodon occllipinnis Macleay, Proc. Linn. Soc. New South Wales, vol. 3, 

 1878, p. 33, pi. 3, fig. 1. King George's Sound. 



Vinculum ocellipinnis McCtjlloch, Biol. Res. Endeavour, vol. 4, pt. 4, 1916, 

 p. 193 (note on type). 



Snout shorter than eye. Preopercle strongly serrate. D. X, 23; 

 A. Ill, 19. Scales 50. Six black vertical bands; first through eye 

 from occiput and on breast to ventral; second from predorsal; third 

 from spinous dorsal medially; fourth from soft dorsal front to anal; 

 fifth from soft dorsal posteriorly to anal posteriorly ; sixth on caudal 

 peduncle posteriorly. Large black, white-edged ocellus on soft dorsal 

 front and another on anal front. Length 83 mm. (Macleay.) 

 Genus HENIOCHUS Cuvier 

 Heniochus Cuvier, Regne Animal, vol. 2, 1817, p. 335. Type Chaetodon 

 macrolepidoitis Linnaeus, designated by Jordan and Evermann, Genera 

 of Fishes, vol. 1, 1917, p. 105 (not versus Henioche HtJBNER, 1916 in 

 Lepidoptera). 

 Taurichihys Cuvier, Regne Animal, vol. 2, ed. 2, 1829, p. 192. Type 

 Taurichthys varius Cuvier, designated by Bleeker, Arch. Neerland. Sci. 

 Nat., vol. 11,1876, p. 304. 

 Diphreutes Cantor, Journ. Asiat. Soc. Bengal (Cat. Malay Fish.), vol. 18, 

 pt. 2, 1849, p. 1141. Type Chaetodon macrolepidotus Linnaeus, monotypic. 

 Loa (not Stiles 1902) Jordan, Proc. U. S. Nat. Mus., vol. 59, 1922, p. 652. 



Type Loa excelsa Jordan, orthotypic. 

 Roa Jordan, Copeia, No. 118, May 20, 1923, p. 63. Type Loa excelsa 

 Jordan, virtually (as Roa proposed to replace Loa). 



Body greatly compressed, well elevated. Muzzle short. No teeth 

 on palate. Forehead often with bony or hornlike projections with 

 age, Preopercle without spine. Scales moderate. Dorsal spines 11 

 to 13, fourth greatly elevated and filiform. Differs from Chaetodon 

 and related genera chiefly in its elongated fourth dorsal spine. 



ANALYSIS OF THE SPECIES 



a'. Taurichthys. Fourth dorsal spine not prolonged in filament long as entire 

 fish; body v.-ith 2 to 4 dark transverse bands, variably broad, never as 2 median 

 similarly broad and sharply defined. 



6'. Body with greater median portion, including ventrals and ana! dark; head 

 and front uniformly dark, separated from body by pale transverse band 



from front of dorsal to breast varius 



i>2. Body with 3 or 4 dark transverse bands. 



c'. Body with 3 dark well defined transverse bands. 



dK Dark bands transverse, first from front of spinous dorsal to chin, 

 second from spinous dorsal medially to belly includes ventral, third from 

 bases of last dorsal spines to last half of soft anal monoceros 



