328 PROCEEDINGS OF THE ACADEMY OF [June, 



Leporinus fasciatuB (Bloch). 



Head 3i; depth 2|; D. in, 10, i; A. iii, 8, i; scales 34 in lateral line 

 to base of caudal, and 5 more on latter; 6 scales obliquely back from 

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

 ventral to lateral line ; 5 scales obliquely forward from origin of anal to 

 lateral line; 12 scales before dorsal; snout 2^ in head; eye 4|-; inter- 

 orbital space 2f; pectoral If ; ventral If; least depth of caudal peduncle 

 2^. Middle of orbit a little anterior in head. Rakers 5 + 8, denticle- 

 like, compressed and weak. Predorsal and postdorsal regions rounded. 

 Very slight lateral keel on each side of postventral region, and also one 

 on each side of preventral region. Median line of both these areas also 

 with a slight keel, that of latter most pronounced. In coloration it 

 agrees largely with Bloch's figure. The occipital band is broader. 

 First band on trunk forking above, second inclined to base of pectoral, 

 sixth also forked above and extending towards origin of anal, seventh 

 from base of adipose fin to bases of last anal rays, and last or ninth 

 in form of large blotch at base of caudal. An indistinct brownish bar 

 about opposite middle of pectoral and a blotch near its tip or above 

 base of ventral. Traces of two transverse caudal bands. Length 5^ 

 inches (caudal damaged). Rio Parahyba, Brazil. Museum of Com- 

 parative Zoology, Massachusetts. One example. 



Leporinus friderici (Bloch). 



Leporinus frederici Cope, Proc. Amer. Philos. Soc. Phila., XI, 1869-70 



(August 19, 1870), p. 566. Pebas, Eastern Peru. John Hauxwell. 



Cope, I.e., XVII, 1877-78 (May 17, 1878), p. 690. Peruvian Amazon. 

 Prof. J. Orton. 



Head 3^ to 3^; depth 3^ to 3f ; D. ii or in, 10, i; A. in, 8, i; scales 

 33 to 35 in lateral line to base of caudal, and usually 4 more on latter; 

 11 to 13 scales before dorsal; 5 scales in an oblique series back from 

 origin of dorsal to lateral line; 5 scales obliquely forward from origin 

 of ventral to lateral line ; 5 scales obliquely forward from origin of anal 

 to lateral line; snout 2f to 3 in head; eye 3f to 4f ; interorbital space 

 2 to 2^. Gill-rakers slender short denticles usually a little bent distally, 

 and about 20? on first arch. Color in alcohol very dark, base of each 

 scale darker than other portion, and line of demarcation very distinct, 

 so that an imbricated appearance is assumed. In smaller examples 

 pectoral approaches nearer ventral than in adults. Total length of 7 

 examples 3^ to 9 inches. Peruvian Amazon. Prof. J. Orton. Coll. 

 of 1877. 



Two examples from Pebas. John Hauxwell. Both show about 

 same number of scales as preceding. The smaller one has the dark 

 lateral blotches more or less confluent posteriorly, as described by Dr. 

 Giinther. 



