142 BULLETIN 10 0, UNITED STATES NATIONAL MUSEUM 



Genus HEMITAURICHTHYS Bleeker 



Hemitanrichthys Bleeker, Arch. N^erland. Sci. Nat., vol. 11, 1876, p. 304. Type 

 Chaetodon polylepis Bleeker, monotypic. 



Differs from Chaetodon chiefly in its small scales and teeth and 

 fewer dorsal rays. 



ANALYSIS OF THE SPECIES 



a^ Yellow, with head and occiput lavender, also large triangular lavender Ijlotch 



on back with angle at last dorsal spines zoster 



a-. Uniform neutral dusky, especially fins terminally thompsoni 



HEMITAURICHTHYS ZOSTER (Bennett) 



Chaetodon zoster Bennett, Proc. Comni. Zool. Soc. London, vol. 1, 1831, p. 

 61. Mauritius.— GtJNTHER, Cat. Fish. Brit. Mus., vol. 2, 1860, p. 33 

 (copied). — Peters, Monatsber. Akad. Wiss. Berlin, 1876, p. 437 

 (Mauritius).— Ahl, Arch. Naturg., vol. 89, abth. A, Heft 5, 1923, p. 38, 

 pi. 2, fig. 7 (New Guinea, Mauritius). 



Chaetodon polylepis Bleeker, Act. Soc. Sci. Ind. Neerland., vol. 2, No. 2, 

 1857, p. (4) 54. Amboina.— GtJNTHER, Cat. Fish. Brit. Mus., vol. 2, 1860, 

 p. 35 (no locality). — Elera, Cat. Fauna Filipin., vol. 1, 1895, p. 488 

 (Luzon, Manila). 



Hemitaurichthys polylepis Bleeker, Atlas Ichth. Ind. N6erland., vol. 9, 

 1877, p. 31, pi. (14) 378, fig. 4 (Amboina and Timor).— Fowler, Occ. 

 Papers Bishop Mus., vol. 8, No. 7, 1923, p. 384 (Honolulu). — Herre and 

 MoNTALBAN, Philippine Journ. Sci., vol. 34 No. 1, September, 1927, p. 73 

 (Quiminatin Island). 



Depth 12^ to 1%; head 3 to 3}i, width 1% to 2}^. Snout 2% to 

 3i^ in head from snout tip; eye 3 to 3)^, 1 to !}{ in snout, 1 to 13^ 

 in interorbital; maxillary % to 3^ in snout, 4 to 43^8 i^i head; inter- 

 orbital 2J/8 to 33^^, broadly convex. Gill rakers 3 + 9 short points, 

 }/q of gill filaments, which 1}4, in eye. 



Scales 48 to 56 between gill opening and caudal base; tubes 56 to 

 63 in lateral line to caudal base; 14 scales above lateral line, 32 or 33 

 below. Scales with 7 to 9 basal radiating striae; apical denticles 48 

 to 52 with 4 to 6 transverse series of basal elements; circuli fine. 



D. XI or XII, 24, i or 25, i, last spine 13^ to 1% in total head 

 length, eight ray 13^ to 13<4 ; A. Ill, 21, i, last spine 1% to 1%, eighth 

 ray 1% to 1^^; least depth of caudal peduncle 2^ to 3; caudal 13^ to 

 1%, hind edge slightly convex; pectoral 25^5 to 2% in combined head 

 and body; ventral 2^ to 3. 



Head, breast, front of back and most of spinous dorsal over anterior 

 % at least, brown. Soft dorsal and back adjacent and down to lat- 

 eral line also brown, likewise most of anal and caudal. Rest of body, 

 especially side, with angular area up, below last dorsal spines grayish 

 brown. Paired fins dull brownish, more deeply brownish on ventrals 

 submarginally. Iris brownish. 



Mauritius, East Indies, Hawaii. It is quite evident Chaetodon 

 zoster Bennett is the earliest name available for this species. Though 

 very briefly described, the account agrees. 



