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Show 1887.] BY MR. C. BUCKLEY IN EASTERN ECUADOR. 275 CHROMIDES. 1. ACARA SYSPILUS, Cope. Acara syspilus, Cope, Proc. Acad. Philad. 1872, p. 255. Canelos. 2. CRENICICHLA SAXATILIS, L. Canelos. SILURID.K. 3. P I M E L O D U S BUCKLEYI, sp. n. (Plate XX. fig. 1.) Pimelodus lateristriga (non Mull. & 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, occupying 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 millim. 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 prsemaxillary 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 |