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Show 1887.] BY MR. C. BUCKLEY IN EASTERN ECUADOR. 277 Mri? ^f-eCieS Wkh °thers obtained °y Mr- Edward Whymper at j-n ri E c u a d o r » an(l which are undoubtedly the Brontes prena-l ' ^ V'> * a m convinced that Steindachner's recent suggestion that A. brachycephalus is identical with A. prenadilla is correct. 8. PLECOSTOMUS BICIRRHOSUS, Gron. Two young specimens from Canelos. 9. CH^ETOSTOMUS CIRRHOSUS, Val. Canelos. 10. CH-ETOSTOMUS MICROPS, Gthr. Canelos. 11. CH^ETOSTOMUS DERMORHYNCHUS, sp. n. (Plate XXII.) D. 1/8. A. 1/5. P. 1/6. V. 1/5. L. lat. 25. Allied to C. microps, Gthr., and C. nudirostris, Ltk. Head and body much depressed, without any prominence; the width of the head equals its length, and is one third of the total (without caudal) ; the entire margin of the snout naked, soft, swollen, without tentacles ; fold of the upper lip short, not prolonged in the middle; barbel very short. Diameter of the eye about one sixth of the length of the head, and three fifths of the width of the interorbital space. Interoperculum with four or five strong, hooked, erectile spines, none of which are as long as the diameter of the eye. Thorax and abdomen entirely naked. Dorsal fin slightly higher than long ; the length of the anterior rays nearly equals the length of the head; the basal length of the fin is less than its distance from the caudal; six scutes between the two dorsal fins. Caudal fin feebly emarginate, lower lobe longest; anal moderate ; ten scutes between anal and caudal. Pectoral spine of moderate strength, extending beyond the root of the ventral. Scutes of body not keeled, with short spines along the margin ; posthumeral ridge indistinct. Olive-brown above, each dorsal scute with a rather indistinct light central dot; an indistinct dark lateral band; dorsal fin witb light dots; lower surfaces whitish. Total length 148 millim. Three specimens from Canelos. 12. LORICARIA FILAMENTOSA, Stdr. Loricaria filamentosa, Steind. Denkschr. Ak. Wien, xxxix. 1879, p. 45, pl. ix. Canelos. 13. LORICARIA LANCEOLATA, Gthr. Loricaria lanceolata, Giinth. Proc. Zool. Soc. 1868, p. 235, fig. 3. Two specimens from Canelos, one of which agrees in every respect with the type. The other, an adult male with long hair-like bristles |