268 Annals of the Carnegie Museum. 



snout with the origin of the dorsal, ventrals not reaching anal; pec- 

 torals about equal to postorbital part of head and half the eye. 



Caudal naked; the minute scales of the sides extending a little way 

 on the base of the anal; 



A minute spot just above the lateral line an orbital distance from 

 its origin. 



35. Metynnis roosevelti sp. nov. (Plate LV.) 



5738 a-d. C. M. Four, 90-118 mm. Santarem, Dec. 5, 6, 1909. 

 Haseman. 



The formulae in the four specimens are: 



D. 15; A. 40; Serrae 34 



16 43 33 



17 41 31 

 16 42 33 



5739 (J'~(^- C. M. Three, 62-140 mm. Bastos, June 26, 1909. Hase- 

 man. 



In two specimens the formula is D. 17; A. 41; serrse 38, in the third 

 specimen it is D. 18; A. 42; serrae 42. 



5740 a-c. C. M. Three, 115-120 mm. Manaos. The smallest is 

 the type. 



D. 17; A. 40; serrae 33; D. 15; A. 36; serrse 34; the serrae in the 

 third specimen number 35. 



Head 4; depth 1.4, not equal to the length without the head. 

 D. 15-18; A. 36-43; serrae 31-42; scales about 85. Interorbital 2 in 

 the length of the head; eye 3 in the head; gill-rakers 9 + 17, longest 

 about 2 in eye. 



Profiles in front of dorsal and ventrals nearly symmetrical, there 

 being but a faint depression over the eyes. 



Occipital process extending one-third to the base of the dorsal; 

 second suborbital bordered by a naked area equal to its own width. 



Origin of dorsal equidistant from snout and end of scales at base 

 of caudal, tip of highest ray usually not reaching adipose; base of 

 adipose about equal to postorbital part of head and half the orbit; 

 depth of caudal peduncle equal to eye and half the snout in the 

 larger, but little greater than eye in the smaller; origin of anal equi- 

 distant from snout with the base of one of the posterior rays of the 

 dorsal; distance between snout and ventrals greater than distance 

 between snout and dorsal; ventrals not reaching anal; pectorals equal 

 to postorbital part of head and half the eye. 



