THE GYMNOTID EELS OF TROPICAL AMERICA. 147 



18. Sternarchus leptorhynchus Ellis. (Plate XXII, fig. 4.) 



Ellis, in Eigenmann, Freshwater Fishes of British Guiana. Mem. Carnegie Mus., 

 Vol. V, 1912, 439. 



1762 C. M., type, 260 mm. Amatuk, Eigenmann. 



12588 I. U. M., cotype, 160 mm. (Length estimated; specimen broken.) 

 Amatuk, Eigenmann. 



1763 C. M., cotype, 98 mm. Warraputa, Eigenmann. 



Head 4.9 to 5.2, greatest depth about 6.75 in the length to the end of the anal; 

 anal rays 158-160; snout 2.2 to 2.3, interorbital 6.5 to 7.5 in the head; eye about 



9 in the snout, 20 to 22 in the head, and 3 to 4 in the interorbital; 13 to 15 rows 

 of scales above the lateral line. 



Compressed and elongate; width of the head 3 or a little more, depth of the 

 head in occipital region 1.3 to 1.5 in the greatest depth of the body; anus about 4 

 orbital diameters behind the vertical from the eye; dorsal profile of the head and 

 anterior sixth of the body abruptly sloping ventrally, dorsal profile of the remainder 

 almost straight; ventral profile very weakly convex or almost straight. 



Snout heavy, rather long and slightly rounded; mouth large; gape reaching to 

 just below the eyes; jaws equal, the lower included; teeth minute, conical, and few, 

 in two irregular, somewhat incomplete rows along each side of the lower jaw and 

 in two irregular patches on the upper jaw. 



Caudal 3.8 to 4, pectorals 2 to 2.25 in the head; origin of the anal about the 

 length of the snout behind the vertical from the eye. 



Color a uniform, dark seal-brown; a dirty white spot at the origin of the 

 caudal; a more or less interrupted pale yellow streak running along the median 

 dorsal line from the tip of the snout to middle of the back or farther (this streak is 

 a distinct band in the smallest specimens); lips cream-white; fins hyaline; rays 

 outlined with dark brown. 



Known only from British Guiana. 



19. Sternarchus hasemani sp. nov.^ (Plate XXIII, fig. 1.) 



3191 C. M., type, 170 mm. to base of caudal. Santarem, Dec. 15, 1909, 

 Haseman. 



3192 C. M., cotypcs, nineteen, 150-200 mm. (length not definite as all have 

 the caudal region in various stages of regeneration). Santarem, Dec. 15, 

 1909, Haseman. 



Head 1 to 1.25 in the greatest depth of the body; snout 2.8 to 3.5 in the head; 

 interorbital 1.2 to 1.5 in the snout, about 3 in the head; eye 4 to 5 in the snout, 



10 to 12 in the head; 11 to 15 rows of scales above the lateral line. 



Body compressed; head somewhat conic; width of the head 2.3 to 3, depth of 



' Named for Mr. Johu D. Haseman, who collected all of the specimens of this species. 



