52 BULLETIN 10 0, UNITED STATES NATIONAL MUSEUM 



Chaetodon oligacanthus Bleeker, Nat. Tijds. Nederlaud. Indie, vol. 1, 

 1850, p. 105. Batavia.— GtJNTHER, Cat. Fish. Brit. Mus., vol. 2, 1860, 

 pp. 34, 516 (Malayan Peninsula). — Kner, Reise Novara, Fische, 1865, 

 p. 102 (Madras). — Gunther, Cruise of Curagoa, Brenchley, 1873, p. 410 

 (Misol, Moluccas). — Day, Fishes of India, pt. 1, 1875, p. 109. — Martens, 

 Preuss. Exp. Ost-Asien, 1876, p. 388 (Singapore, Amboina). — Macle>>ji, 

 Proc. Linn. Soc. New South Wales, vol. 2, 1878, p. 35i v^'-^-> J>c»i"n-.v.T,^. - 

 Klunzinger, Sitz. Ber. Akad. Wiss. Wien, vol. 80, Heft 1, 1879, p. 360 

 (Port Darwin). — Karoli, Termesz. Fiizetek, Budapest, vol. 5, 1881, p. 

 155 (Selila).— Elera, Cat. Fauna Filipin., vol. 1, 1895, p. 487 (Samar 

 and Cebu). — Duncker, Mitt. Nat. Mus. Hamburg, vol. 21, 1903 (1904), 

 p. 151 (Singapore). 



Chaetodon oligacanthus Meyer, An. Soc. Espanola, Hist. Nat. Madrid, vol. 

 14, 1885, p. 17 (Cebu). 



Tetragonoptrus oligacanthus Bleeker, Nederland. Tijds. Dierk., vol. 2, 1865, 

 p. 31 (Manila Bay). 



Chaetodon townleyi De Vis, Proc. Linn. Soc. New South Wales, vol. 9, 1885, 

 p. 454. Moreton Bay, Queensland. 



Depth l}4 to 13/^; head 2% to ZYs, width 2 to 2)4. Snout 3 to 3^ 

 in head from snout tip; eye 3^5 to 4, 1 to 13^-^ in snout, 1 to 1)^ in 

 interorbital ; maxillary % to ^ in snout, 2>}/2 to 4 in head; interor- 

 bital 33^ to ZJi, broadly convex. Gill rakers 5 + 9, short points, 

 3^ of gill filaments which 13^ in eye. 



Scales 39 to 42 between gill opening and caudal base; tubes 32 to 34 

 in lateral line ; 14 or 1 5 scales above lateral line, 27 or 28 belov/. Scales 

 with 9 or 10 basal radiating striae; apical denticles 50 to 96, with 10 

 to 15 transverse series of basal elements; circuli fine. 



D. VI, 28, I or 29, i, last spine 13^^ to 1% in total head length, first 

 ray 23/g to 3; A. Ill, 19, i or 20, i, third spine 1% to 23^, first ray \% 

 to 1^; least depth of caudal peduncle 23^ to 2^; caudal 13^ to 1%, 

 hind edge slightly double concave; pectoral 13^ to 13^; ventral 2J^ 

 to-3>^. 



Light brown, greater part of sides below whitish. Five transverse 

 brown bands slightly inclined posteriorly from vertical. Narrow 

 dark band through eye scarcely wider than pupil, from supraoccipital 

 down on side of chest. Second band from predorsal, includes hind 

 edge of gill opening and humeral region, pectoral base into postven- 

 tral region. Third band from spinous dorsal to spinous anal. Fourth 

 band widest, from front of soft dorsal to anal medially. Black ocellus 

 large as eye at base of soft dorsal anteriorly within middle of fourth 

 dark band. Last dark band extends across caudal peduncle, with 

 white marginal line in front and behind. Fins all pale or dull brown, 

 inner ventral border deeper brown, 



India, East Indies, China. Easily known by its greatly elevated 

 soft dorsal anteriorly. Besides the specimens listed below is a small 

 one but 15 mm. long from Port Dupon, Leyte, obtained May 6, 1908, 

 evidently the Tholichihys stage of the present species. 



