92 MEMOIRS OF THE CARNEGIE MUSEUM. 



lary; four broad-tipped, seven-pointed teeth in the dentary in front and with as 

 many as four graduated teeth on the side. Second suborbital covering the entire 

 cheek. About ten rakers on the lower arch of the gill. 



Dorsal pointed, its highest ray longer than head, reaching to within two or 

 three scales of the adipose, its origin about equidistant from tip of snout and caudal; 

 middle caudal rays very short; a pouch on the caudal of the male just below the 

 middle rays covered with scales; in the male the rays of the lower caudal lobe 

 with retrorse hooks, similar to those of the five anterior anal rays in the male; 

 anal short, its margin subtruncate (very slightly emarginate), its rays graduate, the 

 tip of the highest (the third) reaching to last fourth or to base of the last ray; anal 

 base 3.75-4.6 in the length, its origin behind the vertical from the last dorsal ray; 

 origin of ventrals in front of the vertical from the anterior dorsal ray, about 

 reaching the anal; pectorals not quite reaching ventrals or slightly beyond their 

 base. 



Scales thin, regularly imbricate, with as many as ten radial striae; lateral 

 line complete, nearlj^ straight; anal sheath consisting of a single row of scales along 

 the bases of the anterior rays; caudal naked, except for a basal sheath on the lower 

 lobe of the male and the peculiar scales just below the middle rays in the male. 



Scales of the back margined with dark; margins of the myotomes above the 

 anal marked with chromatophores ; no humeral spot ; a silvery band ; a conspicuous 

 black spot on the end of the caudal peduncle, rounded in front, pointed on the bases 

 only of the middle caudal rays; peduncle in front of the spot without chromato- 

 phores. Orange in life above and behind caudal spot. 



One specimen from the Calamar Cienega, 32 mm., C. M. No. 5105, and three, 

 the largest 30 mm., C. M. No. 5106, 1. U. M., No. 12862, may belong to this species. 

 Chromatophores are limited to the dorsal region and to along the base of the anal; 

 the caudal spot is smaller, oval. 



49. Odontostilbe drepanon Fowler. 



Odontostilbe drepanon Fowler, Proc. Acad. Nat. Sci. Phila., 1913, p. 529. (Tribu- 

 tary of the Madeira river near Porto Velho.) 

 Range : Madeira basin. 

 This species is known from the types only. It is quite possible that it will 



prove to be synonymous with 0. fugitiva. 



Head 3.25; depth 3-1/6; D. 10; A. 24; scales 6-38-5; 9 predorsal scales; 



eye 3.25 in the length of the head, maxillary 3.5; interorbital 2.87; depth of caudal 



peduncle 2.66. 



