514 MR. C. TATE REGAN ON THE 
series of teeth of the premaxillaries unicuspid; mandibulary teeth bicuspid; barbel 
extending beyond the gill-opening. Longest branched ray of pectoral somewhat more 
than 3 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 
2% 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. 
Festa. 
11. ARGES MARMORATUS, sp. n. (Plate 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 pramaxillaries 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 2 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 beyoud 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 23 times in the total length, from base of last anal ray to the caudal 6 times. 
srownish, 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. fARGES LONGIFILIS. 
Arges longifilis Steind. Denkschr. Ak. Wien, xlvi. 1882, p. 19, pl. 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 premaxillaries 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 
pei... 
