1906.] NATURAL SCIENCES OF PHILADELPHIA. 451 



jaw crowded into 2 irregular series, inner a little larger, and all more 

 or less tridentate. No maxillary teeth. Mandibular teeth uniserial, 

 but little larger than those in upper jaw, and at symphysis 

 2 close behind outer series. Tongue slender, pointed, fleshy and 

 little free. Interorbital space broad and convex. Gill-opening for- 

 ward opposite anterior margin of eye. Rakers 30 + 65, ciliiform, 

 slender and longer than filaments or ^ of eye. Color in alcohol plumbe- 

 ous-brown on back, side and lower surface leaden, and side of head 

 silvered. Fins all diluted brown, pectoral and caudal dusted with dull 

 brownish dots, and median rays of latter all more or less deep brown. 

 Iris brownish. Length 6 inches. Type. 



The 2 examples from the Peruvian Amazon show : Head 3f 

 to 4; depth 3f ; D. ii, 9; A. iv, 28 or 29; scales about 40 (squama- 

 tion injured) in lateral line to base of caudal, and 3 or 4 more 

 on latter; about 8 scales (according to pockets) obliquely back from 

 origin of dorsal to lateral line, and 3 between latter and origin of anal; 

 about 23 to 25 (squamation injured) before dorsal ; mandible 3^ to 3^ in 

 head; snout 4f to 4f in head, measured from tip of lower jaw; eye 4^ 

 to 4|; interorbital space 3^ to 3J; pectoral 3 in head and trunk; length 

 of fishes (caudal damaged) 8| inches. 



As with Triportheus flavus and T. albus Cope's figure does not show 

 the mandibular cirrus, a character present in all of the examples of the 

 present species, though smaller in the larger. The dark median 

 basal blotch on the caudal is also not shown on his figure. 

 Fseudocorynopoma doriae Perugia. 



Cope, Proc. Amer. Pliilos. Soc. Phila., XXXIII, 1894 (January 5), p. S6. 

 Jacuhy (Brazilian province of Rio Grande do Sul). H. H. Smith. 



Head 3^ to 4; depth 2f to 3; D. ii, 9; A. iv or v, usually v, 30, i to 

 39, I, usually 34, i, frequently 32, i or 35, i, and only seldom 30, i or 

 39, i; scales 33 to 40 in lateral line to base of caudal and usually 1 or 2 

 more on latter; 7 or 8 scales obliquely back from origin of dorsal to 

 lateral line; 6 to 8 scales, usually 7, between origin of anal and lateral 

 line in a vertical series; 16 to 21 scales before dorsals, though usually 18 

 or 19; snout 3f to 4^ in head, measured from tip of upper jaw; eye 3 

 to 3|-; maxillary 2^ to 2^; interorbital space 2 J to 3; pectoral 2f to 

 3^ in head and trunk; length of body (caudals damaged) If to 2^ 

 inches. In all 17 examples. 



Some, apparently females, do not appear to have the dorsal much 

 enlarged, and the anal also smaller. Fully developed males show 

 the distal end of each elongated anterior anal ray with a single series 

 of small tubercles, evidently a character of breeding. 



