1887.] by mr. c. buckley in eastern ecuador. 275 



Chromides. 



1. AcARA sYSPiLus, Cope. 



Acara syspilus. Cope, Proc. Acad. Philad. 1872, p. 2.55. 

 Canelos. 



2. Crenicichla saxatilis, L. 



Canelos. 



SiLURIDJi. 



3. PiMELODUs BUCKLEYi, sp. n. (Plate XX. fig. 1.) 

 Pimelodus lateristriga (non Miill. & Trosch.), Cope, I. c. p. 270. 



D. 1/6. A. 12. P. 1/9. 



Near P. lateristriga. Head naked above ; occipital process 

 narrow, thrice as long as broad, extending to the basal bone of the 

 dorsal spine. Adipose fin much developed, a little more than one 

 third of the total length (without caudal) ; its distance from the 

 dorsal fin is less than the length of the latter. The maxillary 

 barbels extend to the origin of the anal, the outer mandibulars to 

 the extremity of the pectorals. The length of the head is one fifth 

 of the total length (without caudal) ; eyes of moderate size, occupy- 

 ing the middle of the head. Dorsal fin much higher than long; 

 the spine much shorter than the anterior branched rays, two thirds 

 or three fifths the length of the head. Pectoral spine rather longer 

 than dorsal spine, smooth on its inner edge, feebly serrated at the 

 extremity of its outer edge. Caudal fin deeply cleft, with the lobes 

 pointed, the upper being the longer. A dark brown spot on the 

 shoulder, at the origin of the lateral line ; a blackish streak along 

 the latter ; upper half of dorsal blackish; adipose fin with a fine 

 dark brown edge. 



Total length 150 milHm. 



Two specimens from Canelos. 



4. Pimelodus (Rhamdia) longicauda, sp. n. (Plate XX. 

 fig. 2.) 



D. 1/6. A. 10. P. 1/9. 

 Head naked above ; occipital process short, widely separated from 

 the dorsal spine. Adipose fin long, its length being contained once 

 and one third to once and three fourths in the total (without caudal) ; 

 its distance from the dorsal fin is one half or three fifths of its own 

 length. The maxillary barbels extend to the base of the ventrals, 

 the outer mandibulars to the axilla. The length of the head is one 

 sixth of the total length (without caudal) ; the depth of the body 

 below the dorsal equals the depth of the tail above the anal, and is 

 contained nine or ten times in the total length (without caudal). 

 The lower jaw is the shorter ; the band of praemaxillary teeth is about 

 four times as broad as long. Eye equally distant from the end of the 

 snout and the gill-opening ; its diameter a little less than the width 

 of the interorbital space. Dorsal fin higher than long, with the 

 spine very feeble. Pectoral spine very feeble, not striated. The 



