432 MEMOIRS OF THE CARNEGIE MUSEUM 



faintly outlined with black; belly lighter; the lateral line and three stripes parallel 



with it dark (any or all of these stripes, which are ventrad to the lateral line, vary 



considerably in width and intensity, and may even be almost wanting); a black 



bar at the origin of each anal ray; fins hyaline; caudal peduncle bluish gray above 



and pale yellow below. 



Steatogenys Boulenger. 



Steatogenys Boulenger, Trans. Zool. Soc. London, XIV, 1898, 428 (elegans). 



Type, Rhamphickthys elegans Steindachner. 



Distinguished from all other Gymnotids by a small cylindrical filament in a 

 groove on each side of the mental region. Otherwise the same as Hypopomus. A 

 genus of a single species. 



275. Steatogenys elegans Steindachner. 

 Rhamphichthys (Brachyrhamphichthys) elegans Steindachner, "Fisch-fauna des 



Cauca," etc., 1880, 37. 

 Steatogenys elegans Boulenger, Trans. Zool. Soc. London, XIV, 1898, 428. — 



Eigenmann and Ward, Proc. Wash. Acad. Sci., VII, 1905, 171. — Eigenmann, 



Repts. Princeton Univ. Exp. Patagonia, III, 1910, 449. 



Three specimens, 75-192 mm. Kumaka. (C. M. Cat. No. 1756a; I. U. Cat. 

 No. 12614.) 



One specimen (broken; length estimated at 150 mm.). Wismar. (C. M. 

 Cat. No. 1757a.) 



Head 8.25-8.5, depth 5.25-5.5 in the length to the end of the anal; anal rays 

 160, 164, 175, in the Kumaka specimens; snout 3.3-3.7, interorbital 3 or a little 

 more in the head; eye 1.5-1.75 in the snout, 1.7-2 in the interorbital and about 5 

 in the head. 



Compressed back of the head, which is round and chubby; width of the head 

 about 2.5, depth of the head in the occipital region 1.6-2 in the greatest depth; anus 

 on or a little behind the vertical from the eye; dorsal profile convex; ventral profile 

 abruptly convex to origin of the anal, beyond this very slightly convex. 



Snout heavy, blunt; mouth moderate; gape short, not reaching to below the 

 eyes; jaws equal; eyes small; an adipose filament about twice the length of the 

 snout, lying in a groove on each side of the mental region. 



Caudal peduncle not over 2.8 in the total length; pectorals 1-1.2 in the head; 

 origin of the anal below that of the pectorals or a little caudad. 



Ground-color dark golden brown, a series of twelve to twenty irregular bands 

 of dark reddish brown, starting from the median dorsal line and crossing both the 

 body and the anal fin (these bands more or less confluent in the region of the lateral 



