322 PROCEEDINGS OF THE ACADEMY OF [June, 



about seven broad ill-defined dark brown or dusky transverse bands. 

 First three nuchal or predorsal, fourth from base of dorsal, fifth and 

 sixth from postdorsal region, and seventh from base of adipose fin. 

 Fins pale, caudal lighter and with a subbasal transverse blackish line. 

 Iris brownish. 



Length (caudal damaged) 1^ inches. 



Type, No. 21,997, A. N. S. P. Peruvian Amazon or Ucayale River. 

 Prof. J. Orton. Coll. Prof. E. D. Cope. 



This species is distinguished from Pithecocharax anostomus (Linnseus) 

 and P. trimaculatus (Kner) chiefly by the coloration. 



(Named for the Ucayale or Ucayali River, sometimes called Peru- 

 vian Amazon or Paro.) 



Sohizodon fasciatus Agassiz. 



Cope, Proc. Amer. Philos. Soc. Phila., XI, 1869-70 (August 19, 1870), p. 566. 



Para. De Schulte Buckow. Cope, I.e., XVII, 1877-78 (May 17, 1878), 



p. 689. Peruvian Amazon. Prof. J. Orton. 

 Anostomus fasciatus Cope, Proc. Acad. Nat. Sci. Phila., 1871 (1872), p. 258. 



Ambyiacu River, Equador. John Hauxwell. 



Head 3|; depth 3^; D. ii, 9, i; A. ii, 8, i; scales 37 in lateral line to 

 base of caudal, and 4 more on latter; 11 scales before dorsal; 5 scales 

 obliquely back from dorsal to lateral line; 5 scales obliquely up from 

 origin of ventral to lateral line; 4 scales obliquely up from origin of 

 anal to lateral line; pectoral If in head; ventral If; snout 2-^^ in head, 

 from tip of upper jaw; eye 3f ; interorbital space 2. Rakers none. 

 Coloration faded dull brown. Length 6^ inches (caudal damaged). 

 Para, Brazil. De Schulte Buckow. Prof. E. D. Cope. 



Three examples from the Peruvian Amazon, the largest about 7^ 

 inches in length, show: Head 3f to 4; depth 3f to 3i; D. ii, 10, i; A. 

 Ill, 8, i; scales 38 to 40 in lateral line to base of caudal, and 4 on latter. 

 The color-pattern is constant. None of my examples show the dark 

 transverse bar on the lower caudal lobe figured by Agassiz. The dark 

 bars on the trunk are not absolutely vertical, the first two at least 

 inclined a little back. They are also placed about equal in space and 

 not extending across the ventral surface. Agassiz also indicates the 

 eye too low in depth of head. 



One example from the Ambyiacu, 7^ inches long (caudal damaged). 

 John Hauxwell. It agrees with the Orton examples. 



Laemolyta taeniata (Kner). 



Cope, Proc. Acad. Nat. Sci. Phila., 1871 (1S?2), p. 259. Ambjiacu River, 

 Equador. John Hauxwell. 



Head 4; depth 5; D. ii, 10, i; A. iii, 8, i; scales 37 in lateral line to 

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



