402 MEMOIRS OF THE CARNEGIE MUSEUM 



area compressed; dorsal profile from dorsal to base of occipital process forming an 

 arc of a circle whose center is near the origin of the anal ; profile depressed over the 

 eye, rising slightly forward, the lowest point in the profile nearly half an orbital 

 diameter below the line joining the tij) of the snout and the tip of the occipital 

 process; mouth very oblique; maxillary extending to the end of the first suborbital; 

 maxillary-premaxillary border two-thirds the length of the head; cheek very deep; 

 a large part below the second suborbital naked; preopercle with a distinct angle. 



Gill-rakers 6 -|- 8, strong, the longest about two-thirds the length of the eye. 



Origin of dorsal a little nearer to tip of snout than to caudal, its height about 

 3.5 in the length; caudal small, its lobes 4 in the length; origin of anal in advance 

 of the vertical from the origin of the dorsal, nearer to the tip of the snout than to 

 the base of the last anal ray, its margin very slightlj^ concave; ventrals reaching 

 considerably beyond origin of anal; pectorals to about the middle of the ventrals. 



Scales largest above the pectoral, becoming minute on the predorsal area; 

 lateral line nearly straight; fins naked; no longitudinal strite, scales with smooth 

 edges. 



A vertical, irregular humeral spot over the seventh or eighth scale of the 

 lateral line; a triangular caudal spot, frequently very obscure. 



256. Charax rupununi sp. nov. 



Type, 58 mm. Rupununi. (Carnegie Museum Catalog of Fishes No. 2135.) 



Cotypes, four specimens, 46-51 mm. Rupununi. (C. M. Cat. No. 2136o; 

 I. U. Cat. No. 12814.) 



Head 3.8; depth 3; D. 11; A. 46-48; scales 10-42 to 44-7; eye .7 in snout, 

 3 in head, .7 in interorbital. 



Very similar to C. gihhosus, but the scales much larger; subpectoral blade 

 of the clavicle prominent, its posterior spine extending to below the base of the 

 last pectoral ray, its anterior spine claw-like, rising above the edge of the blade, 

 directed upward, outward, and forward (simply forward in gihhosus), outer surface 

 of the blade concave. Predorsal line naked (?). 



A small black spot over the seventh scale of the lateral line; a deep-lying 

 black vertical line at the base of the caudal rays, a black spot contiguous with it 

 forward. Otherwise as in C. gihhosus. 



ASIPHONICHTHYS CopC. 



Type, Asiphonichthys stenoptenis Cope. 



This genus has all the characters of typical Charax, except that the lateral line 

 is developed on a few anterior pores only. 



