276 MR. G. A. BOULENGER ON FISHES COLLECTED [Mar. 1, 



posterior anal rays do not extend to the vertical from the end of the 

 adipose fin if laid backwards. The free portion of the tail is as deep 

 as long. Caudal fin deeply forked, the upper lobe much produced, 

 much longer than the lower, measuring more than one fourth of the 

 total length. Upper parts brownish, lower whitish. 



Total length 1/5 millim. 



Four specimens from Canelos. 



5. PiMELODUS (PSEUDOPIMELODUS) PULCHER, Sp. n. (Plate 



XXI. fig. 1.) 



D. 1/6. A. 9. P. 1/5-6. 



Head naked above ; occipital process short, about as long as and 

 in contact with the basal bone of the dorsal spine. The length of 

 the adipose fin equals about three fourths of its distance from the 

 dorsal, or the depth of the tail below its origin. The maxillary 

 barbels extend to the base of the pectoral spine ; the outer mandi- 

 bulars a little shorter than the maxillaries. The length of the head 

 is about two sevenths of the total (without caudal) ; the depth of 

 the body below the dorsal one fifth or one ninth of the total length 

 (without caudal). Head slightly longer than broad. The band of 

 teeth in the upper jaw is of moderate breadth, without prolonged 

 lateral portion. Byes very small, directed upwards, and covered 

 with skin. Dorsal fin a little higher than long, with strong serrated 

 spine. Pectoral spine very stout, depressed, very strongly serrated 

 along its inner, less so along its outer edge. Caudal forked. Pale 

 brownish on the head and body, with a dark brown band encircling 

 the body and covering the dorsal fin, save its upper border, which is 

 white ; head dotted with brown ; tail and caudal dark brown, with 

 a large round light spot on each side of the free portion of the tail 

 (sometimes confluent) ; two large whitish spots, one above the other, 

 on the caudal, the extremity of which is whitish ; adipose fin dark 

 brown, whitish in front and behind ; pectoral and ventral with one, 

 anal with two dark brown cross bands. 



Total length S7 millim. 



Three specimens from Canelos. 



6. Cetopsis plumbeus, Stdr. 



Cetopsis plumbeus, Steind. Denkschr. Ak. Wien, xlvi. 1883, p. 31, 

 pi. vi. fig. 3. 

 Sarayacu. 



7. Stygogenes humboldti, Gthr. (Plate XXI. fig. 2.) 



One specimen, 56 millim. long, from Pallatanga. Specimens from 

 Canelos are mentioned by Steindachner. They are of great interest 

 as settling the point of the exact habitat of the species, those upon 

 which it was established being without locality. Whether S. hum- 

 boldti is identical with Humboldt's Pimelodus cyclopum must remain 

 an open question. The opinion of Putnam (Amer. Nat. 1871, p. 694) 

 loses all value from the fact that he also proposes to unite Arges 

 brachycephalus, Gthr. ! On comparison of young specimens of the 



