THE GVMNOTID^ l6$ 



7. STERNARCHOGITON NATTERERI (Steindachner). 



Sternarchus «ci'//^rf;"/ Steindachner, Die Gymnotidiu, 3, pi. II, 

 fig. I, 188S, Barrado RioNegro ; Giinther, Cat., VIII, 3, 1870; 

 Eigenmann & Eigenmann, Proc. U. S. Nat. Mus., XIV, 1891, 

 62 ; Boulenger, Trans. Zool. Soc, XIV, 427, 1898 (Rio Jurua) 

 Habitat: Barra do Rio Negro and Jurua. 



8. STERNARCHOGITON SACHSI (Peters). 



SteniarcJms sachsi Peters, Mb. Akad. Wiss. Berl. 1877, 473, 

 Apure ; Eigenmann & Eigenmann, Proc. U. S. Nat. Mus., 

 XIV, 189T, 62. 

 Habitat : Orinoco. 



4. Sternarchorhamphus Eigenmann, new -genus. 

 (Figs. 6 and 7.) 



Type : Sternarchtis imilleri Steindachner. 



This genus is intermediate between Sternarchus and Ster- 

 narchorhynchus, having the long snout of the latter and the 

 mouth in size approaching the former. 



Geographical distribution of the species : Amazon at Para 

 and in Peru. 



a. Snout nearly or quite straight, the gape wide, more than half 

 length of snout ; eye midway between pectoral and tip of snout ; 

 mandible with a series of fine teeth on each side; depth 2.5 in 



head; A. 202. (Giinther) 7?iacrosto??ius^g. 



aa. Snout nearly straight, the gape moderate, \ length of snout; 

 depth of head 1.6 in its length ; 3 rows of slender teeth in lower 

 jaw, 2 rows of smaller teeth in upper jaw; eye minute; depth 

 less than length of head, 11 to 12 in total length. (Stein- 

 dachner) vmlleri^ 10. 



aaa. Snout straight ; gape very small, not more than -^-^ of the length 

 of the snout; depth of head about i of its length ; eye ex- 

 tremely minute, about midway between pectoral and tip of 

 snout ; several rows of minute teeth ; depth of body \ the 

 length of the head ; a very strongly developed adipose fin 

 along entire length ; vent under chin. A. 220, originating 

 a little in advance of gill-opening; lat. line S5. (Boulenger) 



tainandtia^ 1 1. 



