THE GYMNOTID EELS OF TROPICAL AMERICA. 15 
ia. 15. Poroterqus gimbeli Ellis. 
24. Porotergus gymnotus Illis. (Plate XXIII, fig. 4.) 
Porotergus gymnotus Exurs, in Higenmann, Freshwater Fishes of British Guiana. 
Mem. Carnegie Mus., Vol. V, 1912, 441. 
1759 C. M., type, 70mm. Amatuk, Higenmann. 
12636 I. U. M., cotype, two, 68 and 85 mm. Amatuk, Higenmann. 
1758 C. M., cotype, one, 62 mm. Konawaruk, Migenmann. 
Head 6 to 6.5, greatest depth 6.2 to 6.7 in the length to the end of the anal. 
Anal rays 130-147; snout 2.2 to 2.5 in the head, interorbital about the same; 
eye 5 or 6 in the snout and 12 to 14 in the head; 5 to 8 rows of seales above the 
lateral line; mid-dorsal space naked and abundantly supplied with mucous pores. 
Compressed and slender; depth of the head in occipital region 1.25 to 1.5 in 
the greatest depth; anus not quite the length of the snout behind the vertical 
from the eye; dorsal profile behind the head almost straight, the head sharply 
sloping; ventral profile slightly convex, save in the mental region, where it is rather 
concave. 
Snout heavy and somewhat truncate; mouth moderately large; gape straight, 
not quite or barely reaching below the eye; jaws stout, lower included on the 
sides; teeth few, small, conical, in two irregular interrupted rows, the inner one of 
the lower jaw represented by but three or four teeth, two small patches of not 
over six teeth each in the upper jaw. 
Caudal 2.8 in the head, pectorals 1.3; origin of the anal a little in front of the 
gill-opening. 
Ground-color dark golden brown, darker dorsally; seales, anal rays, and parts 
of the head outlined with dark brown; upper parts of the head and back, also a 
spot at the origin of the lateral line, almost black; cheeks brown with numerous 
8 Type, Amatuk, 138. Cotypes, Amatuk, 140, 141. Cotype, Warraputa, 147. Cotype, Konawaruk, 
130, 
