314 ME. C. TATE BEGAN ON THE 



series of teeth of the praemaxillaries unicuspid ; mandibulary teeth bicuspid ; barbel 

 extending beyond the gill-opening. Longest branched ray of pectoral somewhat more 

 than f the length of the spine, which extends a little beyond the middle of the ventral ; 

 ventrals originating nearly below the first dorsal ray, extending a little beyond the anal 

 opening; distance from the base of the ventrals to the anal opening twice that from 

 the latter to the base of the first anal ray. Adipose fin well developed, originating at 

 a distance from the dorsal nearly equal to the length of the base of that fin, extending 

 on to the caudal, with a very small nodule, representing the spine, imbedded in the 

 upper half of its posterior part. Distance from tip of snout to base of first dorsal ray 

 2f times in the total length, from base of last anal ray to the caudal 6^ times. Greyish, 

 indistinctly marbled with darker ; some dark spots on the caudal. 



Total length 92 mm. 



A single specimen from the Chota Valley, Northern Ecuador, collected by Dr. H. 

 Testa. 



11. Akges marmoratus, sp. n. (Tlate XXI. fig. 6.) 



Length of head 4 times in the total length. Interocular width greater than the 

 distance from eye to posterior nostril, 3 times in the length of head. Outer series of 

 teeth of the prsemaxillaries unicuspid ; mandibulary teeth bicuspid ; barbel extending 

 beyond the gill-opening. First dorsal ray as long as the head ; longest branched ray 

 of pectoral equal to •§- the length of the spine, which extends nearly to the posterior 

 end of the ventral ; ventrals originating nearly below the first dorsal ray, extending to 

 a little beyond the anal opening, which is situated midway between the base of the 

 ventrals and that of the first anal ray. Adipose fin well developed, extending from 

 just behind the dorsal on to the caudal, with a nodule, representing the spine, imbedded 

 in the upper half of its posterior part. Distance from tip of snout to base of first 

 dorsal ray 2J times in the total length, from base of last anal ray to the caudal G times. 

 Brownish, marbled with blackish ; caudal with some dark spots. 



Total length 73 mm. 



Two specimens, from St. Augustin, Andes of Colombia, 5000 ft., collected by Capt. 

 Dowding. 



12. f Arges longifilis. , . 



Arges longifilis Steind. Denkschr. Ak. Wien, xlvi. 1882, p. 19, pi. v. fig. 3. 



Length of head 3^-4 times in the total length. Interocular width a little less than 

 the distance from eye to posterior nostril, 3^ times in the length of head. Outer series 

 of teeth of the prasmaxillaries unicuspid ; mandibulary teeth bicuspid ; barbel extending 

 to, or nearly to, the gill-opening. First dorsal ray equal to, or a little more than the 

 length of head; pectoral spine extending to the extremity of ventral; ventrals 



