312 MR. C. TATE REGAN ON THE 
ventral to the origin of anal. Adipose fin long, very weakly developed, with a small 
imbedded spine. Distance from tip of snout to base of first dorsal ray 2% times in the 
total length, from base of last anal ray to caudal 5 times. Lrownish, closely spotted 
with darker. 
Total length 84 mm. 
A single specimen from Milligalli, Andes of Ecuador. 
6. ARGES EIGENMANNI, sp.n. (Plate XXI. fig. 3.) 
Cyclopium cyclopum (non Humb.) Putnam, Am. Nat. 1871, p. 694; Eigenm. & Eigenm. Proce. 
Cal. Ac. (2) i. 1888, p. 164, and Occ. Pap. Cal. Ac. i. 1890, p. 350. 
Length of head 4} times in the total length. Interocular width nearly equal to the 
distance from eye to posterior nostril, 3}-5% times in the length of head. Outer series 
of teeth of the premaxillaries mostly unicuspid, mandibulary teeth bicuspid; barbel 
extending to }-§ the distance from its base to the gill-opening. First dorsal ray equal 
to 3 the length of head; pectoral spine extending to anterior } of ventral; ventrals 
originating below, or nearly below, the first dorsal ray, extending }-Z of the distance 
from their base to the anal opening, which is situated at ? of the distance from the 
base of ventral to the origin of anal. Adipose fin long, very weakly developed, with a 
small spine which is completely imbedded in the adult. Distance from tip of snout to 
base of first dorsal ray 23-23 times in the total length, from base of last anal ray to caudal 
45-5 times. Greyish, sometimes spotted with darker; usually a series of whitish spots 
on the pores of the lateral line. 
Total length 100 mm. 
Several specimens from Cayambe and Machachi, Ecuador, collected by Mr. E. 
Whymper. , 
7. ARGES VAILLANTI, sp. Nn. 
Length of head 4—41 times in the total length. Interocular width nearly equal to 
the distance from eye to posterior nostril, 33 times in the length of head. Outer series 
of teeth of the premaxillaries mostly unicuspid; mandibulary teeth bicuspid ; barbel 
extending to, or nearly to, the gill-opening. First dorsal ray equal to $ the length of 
head; pectoral spine extending to anterior } of ventral; ventrals originating below, or 
nearly below, the first dorsal ray, extending {4 of the distance from their base to the 
anal opening, which is situated at 3 of the distance from base of ventral to origin of 
anal. Adipose fin weakly developed, with a small spine which is completely imbedded 
in the adult. Distance from tip of snout to base of first dorsal ray 23-2} times in the 
total length, from base of last anal ray to caudal 6 times. Brownish; a large dark 
blotch or bar at the base of the caudal; rays of all the fins with obscure dark spots. 
Total length 95 mm. 
