THE GYMNOTID EELS OF TROPICAL AMERICA. 133 
Rhamphichthys (Brachyrhamphichthys) mirabilis Svmrspacuner, . Come 1 eleXG, 
figs. 1, and ia. 
3165 C. M., nine, 120-140 mm. Santarem, Dec. 15, 1909, Haseman. 
Six, 110-180 mm. Kumaka, Sept. 12, 1910, Ellis. 
1756 C. M., 12614 I. U. M., three, 75-192 mm. Kumaka, Eigenmann. 
1757 C. M., one (broken, length estimated 150 mm.). W ismar, Kigenmann. 
Head 8.25 to 8.5, depth 5.25 to 5.5 in the length to the end of the anal; anal 
rays 160, 164,175 (Kumaka); snout 3.3 to 3.7, interorbital 3, or a little more, in 
the head; eye 1.5 to 1.75 in the snout, 1.7 to 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, its depth in the occipital region 1.6 to 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; a cylindrical filament about twice the length of the 
snout, having its origin near the pectoral, lying in a groove on each side of the mental 
region, both filaments united in median line at the edge of lower lip. 
Caudal peduncle not over 2.8 in the total length; pectorals 1 to 1.2 in the 
head; origin of the anal below that of the pectorals or a little caudad. 
Ground-color of preserved specimens dark golden brown, a series of twelve to 
twenty irregular bands of dark red-brown, starting from the median dorsal line and 
crossing both the body and the anal fin (these bands are more or less confluent in 
the region of the lateral line); small golden brown spots on the median dorsal line at 
the junction of the dark bands from the sides; top and sides of the head almost 
black, with numerous pale yellow streaks crossing them; cheeks lighter; pectorals 
mottled with black; anal with numerous brown spots in the yellow interspaces 
between the brown cross-bands. 
This species which, in a general way, resembles the young of Gymnotus carapo 
is sometimes called by the same name, ‘“Warradiera.” It is also known by the 
name “Corybu.” It inhabits small streams in densely wooded places and is 
occasionally used as food cooked with rice by the Indians. 
Distribution: Barra do Rio Negro, British Guiana, and Lower Amazon. 
VI. Hyporomus Gill. 
Hypopomus Gitu, Proc. Acad. Nat. Sci. Phila., 1864, 152. 
Brachyrhamphichthys GUNTHER, Cat., VIII, 6, 1870, artedi. 
Type, Rhamphichthys miilleri Kaup. 
With fontanels; no caudal; snout short; size small; body elongate and rather 
cylindrical, tapering posteriorly, maximum depth and thickness back of the pec- 
torals; head small, chubby, and conical; mouth and gape small; teeth wanting; eyes 
