320 PROCEEDINGS OF THE ACADEMY OF [June, 



This name is proposed as Anostomus Klein, in Walbaum, Pet. Arted. 

 Gen. Pise, III, 1792, p. 659 (type Salmo anostomus Linnaeus) = Gray, 

 Cat. Brit. Mus. Fish. Gron., 1854, p. 153, is preoccupied in Orni- 

 thology by Anostomus Bonnaterre, Enc. Meth. Ornith., 1790, p. xciii. 



(fJiOrjico^j ape, with reference to the short snout or nose; /a/jaf, 

 Charax.) 



Pithecooharax trimaculatus (Kner). 



Schizodon trimaculatus Cope, Proc. Amer. Philos. Soc. Phila., XVII, 1877-78 

 (May 17, 1878), p. 690. Peru\aan Amazon. Prof. James Orton. Coll. of 



1877. 



Head 4; depth 3; D. ii, 10, i; A. in, 8, i; scales 40 in lateral line to 

 base of caudal, and 2 more on latter; about 16 scales before dorsal; 

 6 scales obliquely back from origin of dorsal to lateral line; 6 scales 

 obliquely up from origin of ventral to lateral line ; 5 scales obliquely 

 up from origin of anal to lateral line; pectoral 1^ in head; ventral If; 

 snout 3 in head, from tip of upper jaw; eye 3f ; interorbital space 2^. 

 Rakers absent. Color in alcohol with each scale marked medianly 

 with a pale area so that longitudinal series are formed, becoming 

 convergent posteriorly. Length 5^ inches (caudal damaged). 



Also another, 3 inches long, with same data. The opercular blotch, 

 on both of my examples, appears to be superior according to such 

 traces of it as remain, rather than inferior as indicated on Kner's 

 figure. 

 Pithecocharax ucayalensis sp. nov. Fig. 16. 



Head 3; depth 3^; D. in, 10; A. in, 8, i; P. i, 12?; V. i, 8; scales about 

 33? in lateral line to base of caudal (squamation injured), and appa- 

 rently several more on latter; about 5? scales between origin of dorsal, 

 obliquely back, and lateral line; about 4? scales between lateral line 

 and origin of anal ; width of head about 2^ in its length ; depth of head , 

 over middle of orbit, about 2; least depth of caudal peduncle 3^; 

 snout 3^ in head, measured from tip of upper jaw; eye 3; interorbital 

 space 3. 



Body elongate, compressed, back a little elevated or with upper pro- 

 file a little more convex than lower, and greatest depth about middle 

 of predorsal region. Predorsal, postdorsal, and preventral regions 

 (desquamated) apparently rounded. Postventral region possibly with 

 median keel? Caudal peduncle compressed, and least depth about | 

 its length. 



Head compressed, elongate, and attenuate inferiorly, or with upper 

 profile much more inclined than lower. Snout short, moderately 

 broad, straight in profile and upper surface convex. Eye circular and 



