554 PROCEEDINGS OF THE NATIONAL MUSEUM. voi.. xxv. 



hence not continuous the whole length of fin; caudal peduncle black, 

 a whitish yellow cross-band behind spine, faint in adult, the anterior 

 margin vertical, the posterior concave; rest of caudal black; pectoral 

 yellowish; ventrals dusky, the spine black. All the marks very faint 

 and often fading- in alcohol. Adult with the pectoral quite yellow; 

 pale band at base of caudal, growing faint with age; a l)lue streak along- 

 base of dorsal. Length ijj inches. Rocky shores throughout the 

 Indian region from the Red Sea to the Hawaiian Islands, everywhere 

 very common, occasionally northward to the projecting headlands of 

 Japan. We have one adult example, described above, from Nafa, in 

 Okinawa. Another adult is from Umesawa, and a young specimen 

 from tide pools at Misaki. The species is very close to Teuthls crestonis 

 of the west coast of Misaki, and to Teuthis hahiamcs of the West Indies. 

 Much of the synonymy of this species is very hypothetical. The oldest 

 name applying to the species beyond a doubt is that of Acanthurus 

 annularis. But there is scarcely any doubt as to A. matoidex, and A. 

 annularis is apparently the young of the same species. The Hawaiian 

 fish should therefore stand as Teuthls argenteiis. The Japanese form 

 is apparentl}' not different. 

 {ctrgentcas, silvery. ) 



22. TEUTHIS BIPUNCTATUS (Gunther). 



?? Acanthurus nigroris Cuvier and Valenciennes, Hist. Nat. Poiss., X, 1835, 



p. 208; Sandwich Islands. 

 AcanthuruH bipundalus GtJNTHER, Cat. Fish., Ill, 1861, p. 331; China, FijL 

 Teuthis hijmndatus Jordan and Evermann, Proc. U. S. Nat. Mu«., XXV, 1902, 



p. 358; Formosa. 

 Acanthurus nigros Gitnther, Cat. Fish., Ill, 1861, p. 832; New Hel)rides. — Ishi- 



KAWA, Pre]. Cat., 1897, p. 34; Miyakoshima. 



Head 3i; depth 2. D. IX-25; A. III-23, P. 1-16; V. 1-5. Body 

 long, compressed, and covered with very small ctenoid scales. . Head 

 long, convex above the eyes; eyes high, 2| in snout, 4 in head, and 1^ in 

 interorbital space; snout slightly produced, 1^ in pectoral, and nearly 

 straight above; head equal to the pectoral; interorbital space strong!}- 

 convex above; nostrils directly in front of the eye, the anterior rounded 

 and the posterior a small slit. Gill-opening equal to the snout; gill 

 rakers ver}- small, short, and few. Origin of the dorsal over that of 

 the pectoral, the spinous part graduated to the middle and then about 

 equal to the rest of the fin, which ends in a point; the spinous anal 

 graduated to the third spine, which is the longest, and not as high as 

 the highest soft rays; soft anal oblong, ending in a point posteriorly; 

 pectoral longer than head; ventrals equal to the snout with the e3"e; 

 caudal lunate, the upper lobes pointed. Caudal peduncle compressed, 

 rather deep, and '2^ in the head. Caudal spine sharp, depressable in a 

 groove, and about 2 in the snout. Lateral line concurrent with the 

 back to the caudal spine. Color in alcohol dark chocolate brown, and 

 with the edge of the caudal narrowly margined with white, a black 



