276 MEMOIRS OF THE CARNEGIE MUSEUM 



Dorsal about equal to the length of the head without the opercle, its origin 

 equidistant from tip of snout and tip of adipose; caudal deeply forked; anal emar- 

 ginate; ventrals not reaching anus by about four scales; pectorals not reaching 

 ventrals by about five scales. 



A large axillary scale; fins naked; scales with several vermiculated horizontal 

 strise. 



Three black cross-bands, the first half-way between dorsal and tip of occipital 

 process, the second from bases of last dorsal rays, and the third in front of the anal ; 

 each caudal lobe with a black band, the lower one continuous with an elongate 

 spot on the caudal peduncle. 



133. Hemiodus semitaeniatus Kner. (Plate XXXVI, fig. 3.) 

 Hemiodus semitamiatus Kner, "Famine der Characinen," i, 1859, 18, pi. 4, fig. 7 



(Rio Guapore). — Gunther, Catalogue, V, 1864, 299. — Eigenmann and Eigen- 



mann, Proc. U. S. Nat. Mus., XIV, 1891, 49.— Boulenger, Trans. Zool. Soc. 



London, XIV, 1896, 34 (San Luis, Matto Grosso). — Eigenmann, Repts. Prince- 

 ton Univ. Exp. Patagonia, III, 1910, 423. 



Seven specimens, 75-86 mm. Konawaruk. (C. M. Cat. Nos. 1931, 1932; I. 

 U. Cat. No. 12190.) 



One specimen. Gluck Island. (C. M. Cat. No. 1945.) 



Very closely allied to H. gracilis Gunther. 



Head 4.3-4.5; depth 4-4.25 (5.6 in the type of gracilis); D. 11; A. 9-11; 

 scales 7-44 or 45-4. Eye 1 in snout, 3.2 in head, 1+ in interorbital. 



Slender; dorsal and ventral profiles equally curved; predorsal and preventral 

 area with regular median series of scales. Snout projecting the width of the upper 

 lip; about twenty-four teeth in the upper jaw. 



Height of dorsal nearby equal to the length of the head, its origin equidistant 

 from tip of snout and tip of adipose; anal short, very slightly emarginate, the 

 longest ray projecting but little beyond the tip of the last ray; caudal deeply forked; 

 ventrals not reaching anus by about four scales; pectorals not to ventrals by about 

 seven scales. 



A large axillary scale; fins naked; each scale with several horizontal stria?. 



Iridescent silvery; an oval black spot on the middle of the sides half-way be- 

 tween the dorsals, a conspicuous black band along the inner margin of the lower 

 caudal lobe, tapering forward to the lateral spot; anal and upper caudal lobe 

 peppered; peppered bands (evident only with a lens) across the sides in front of 

 the dorsal, across the region of the lateral spot, and across the caudal peduncle; 

 dorsal and tips of caudal lobes pink in life. 



