THE GYMNOTID EELS OF TROPICAL AMERICA. 143 



3188 C. M., two, 430 and 500 mm. Alcoboca, Rio Tocantins, Jan. 10, 1910, 

 Haseman. 



3189 C. M., three, 400-425 mm. Para, Jan. 22, 1910, Haseman. 



Head 8.5 to 9.5, greatest depth of body 9.75 to 10.75 in the length to the base 

 of the caudal; anal rays (Para) 248, (Alcoboca) 239, 254, 263 (other Para speci- 

 mens had regenerated caudals). Snout 1.6 to almost 2; interorbital 6.5 to 8.5 in 

 the head; eye 12 to 15 in the snout and 3 to 5 in the interorbital. 



Fig. 10. Slernarchorhaniphus mullcri (Stcindachner). 



Body quite compressed and elongate; head compressed and somewhat pro- 

 duced; width of the head 3 to 3.8; depth of the head in the occipital region 1.5 to 

 almost 2 in the greatest depth of the body; anus about the diameter of the eye in 

 front of the vertical from the anterior margin of the eye; dorsal profile almost 

 straight, sloping slightly from the origin of the dorsal filament; ventral profile 

 behind the head weakly convex. 



Snout produced, tubular, almost straight, slightly upturned and slightly 

 enlarged toward the tip; mouth medium; gape straight, oblique to the axis of the 

 head and equal to about one fourth of the snout; jaws equal, both rounded in front; 

 lower included on the sides; teeth small, villiform, in a band of three or more 

 series around the lower jaw and a band of two or more series on the side and six or 

 seven series in the middle on the upper jaw. 



Caudal fin quite small, 3 to 4 in the snout; pectorals a little more or less than 

 2 in the head. 



Ground-color tawny to dark brown; entire body overlaid m.ore or less with 

 fine violet dots, especially in the region of the lateral line, the dorsal and lateral 

 portions of the head, and the dorsal portion of the body; anal and pectorals bright 

 yellow margined with black; caudal pale yellow; a dark patch at origin of lateral 

 fine; scales small, larger in the region of the lateral line; middorsal region unsealed. 



Known only from the lower Amazon. 



