THE AMERICAN TETRAGONOPTERINAE. 69 



w. Anal rays 23-24; depth 2.6-3.3; lateral line 

 33-35; a well-defined humeral spot. 



26. collelii (Steindachner). 

 ww. Anal rays 18-20; depth 3.33-3.66; lateral line 



32-34 27. copei (Steindachner). 



oo. A large, conspicuous black spot on the base of the caudal; origin 

 of ventrals equidistant from tip of snout and base of caudal. 

 x. Second suborbital leaving a wide naked area; 

 five or six teeth in the inner series of the 

 premaxillary; gill-rakers about 9 and 15, 

 one half as long as eye; 2.5 scales between 

 lateral line and front of anal; middle caudal 

 rays jet black, the color spreading over the 

 base of the fin. Depth 3.25; A. 19; eye 

 greater than interorbital. 



28. ceroa Eigenmann. 

 xx. Second suborbital leaving a very narrow naked 

 area; five teeth in the inner series of the 

 premaxillary; gill-rakers 7 and 9, one fifth 

 as long as eye; 2.5-3.5 scales between 

 lateral line and front of anal; a very large 

 and conspicuous vertically oval spot occupy- 

 ing nearly all the base of the caudal to near 

 the tip of the middle rays, bordered by milk- 

 white; depth 3 + ; A. 20 or 21; eye about 

 equal or less than interorbital. 



29. cotinho Eigenmann. 



1. Moenkhausia bondi (Fowler). 

 Plate 14, fig. 3; Plate 100, fig. 7. 



Phenacogastcr bondi Fowler, Proc. Acad. nat. sci. Phil., 1911, p. 419 (Corisal, Venezuela). 

 Moenkhausia profunda Eigenmann, Mem. Carnegie mus., 1912, 5, p. 322, pi. 46, fig. 1 (Issorora Rubber 

 Plantation). 



Habitat. — Northern Guiana and Venezuela. 



I have been able to examine the type of M. bondi in the collections of the 

 Academy of Natural Science in Philadelphia and 2207 C. Type of M. pro- 

 funda, 51 mm. Issorora Rubber Plantation. Shideler. 



Head 4; depth 1.66-1.8; D. 11; A. 33; scales 8-34-7 (9 to the anal). 

 Eye 2.6; interorbital 2.5. 



Very much compressed; the ventral profile nearly a regular section of a 

 circle; dorsal profile not so greatly and less regularly arched; preventral area 

 very narrowly rounded, without a median series of scales, the lateral scales 

 small and their margins bent over the median ridge; predorsal area narrow, 



