436 MEMOIRS OF THE CARNEGIE MUSEUM 



Head 6-8, greatest depth 11.3-12 in the length to the end of the anal; A. 

 410, 444, 469; snout 1.5-1.8, interorbital 8.5-9.5 in the head; eye 12-16 in the 

 snout, 2.25-3 in the interorbital, 18-22 in the head. 



Compressed and very elongate; width of head 2.3-2.5, depth of head in the 

 occipital region 1.5-2 in the greatest depth; anus on or in front of the vertical 

 from the eye; dorsal profile sloping to the occiput, then almost straight; ventral 

 profile quite straight, except for a slight concavity in the mental region. 



Snout long, tubular, and tapering; mouth small and slightly below the over- 

 hanging upper jaw; gape short and decurved, about one and one-half times the eye; 

 lower jaw included, upper forming the extreme tip of the snout, slightly expanded 

 and blunt at the end; teeth wanting; cheeks full and round; opercle rather 

 prominent; eyes small. 



Caudal peduncle 3.5-4 in the total length; pectorals 2.75 in the head; origin of 

 the anal about three times the eye behind the vertical from the eye. 



Ground-color chocolate-brown to yellowish brown; ventral parts lighter; 

 numerous blotches of dark brown and black dorsally; many irregular bands of 

 dark brown spots and blotches crossing the body and anal; anal heavily marked 

 with black and brown spots over a background of creamy white ; head dark, mottled 

 with large black and small bluish white spots; mental regions almost white; pec- 

 torals spotted with black, brown, and white; caudal peduncle dark chocolate- 

 brown banded with black. 



Gymnorhamphichthys Ellis, gen. nov. 

 Anterior portion of sides without scales, but other characters much the same 

 as in Rhamphichthys. 



279. Gymnorhamphichthys hypostomus Ellis, sp. nov. 70 

 Type, 215 mm. San Joaquin, Bolivia. (C. M. Cat. No. 3182.) 

 Cotype, one specimen, 180 mm. Rio Marmore. (C. M. Cat. No. 3183a.) 

 Two specimens, 140-145 mm. Konawaruk. (I. U. Cat. No. 12641.) 

 Two specimens, 75-115 mm. Bastos. (C. M. Cat. No. 3184a-o.) 

 One specimen, 80 mm. Maciel, Rio Guapore. (C. M. Cat. No. 3185a.) 

 One specimen, 125 mm. Puerto Bertoni, Alto Parana. (I. U. Cat. No. 



12642.) 



Three specimens, 95-100 mm. Tumatumari. (I. U. Cat. No. 12613.) 

 Distinguished from all other Gymnotids, save the Electric Eel, by the absence 



of scales from the anterior portion of the body. 



70 This species was described from specimens from various parts of South America. 



