1887.] BY MR. C, BUCKLEY IN EASTERN ECUADOR. 277 



latter species with others obtained by Mr. Edward "Whymper at 

 Miiligalli, Ecuador, and which are undoubtedly the Brontes prena- 

 dilla, C. & v., I am 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^tostomus cirrhosus, Val. 

 Canelos. 



10. Ch^tostomus microps, Gthr. 

 Canelos. 



11. Ch^tostomus 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 with light dots ; lower 

 surfaces whitish. 



Total length 148 millim. 



Three specimens from Canelos. 



12. LORICARIA FILAMENTOSA, Stdr. 



Loricaria Jllamentosa, Steind. Denkschr. Ak. Wien, xxxix. 1879, 

 p. 45, pi. 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 



