516 MR. C. TATE REGAN ON THE 
15. TARGES PRENADILLA. 
Brontes prenadilla Cuv. & Val. Hist. Nat. Poiss, xv. p. 343, pl. 445 (1840) ; Giinth. Cat. Fish. v. 
p. 224 (1864). 
Arges prenadilla Steind. Denkschr. Ak. Wien, xlvi. 1882, p. 20, pl. vi. fig. 5. 
Length of head 4 times in the total length. Interocular width equal to the distance 
from eye to posterior nostril, 32 times in the length of head. Outer series of teeth of 
the premaxillaries unicuspid; mandibulary teeth bicuspid; barbel not extending to 
the gill-opening. First dorsal ray equal to {-4 the length of the head; pectoral spine 
extending nearly to base of ventral; ventrals originating below the fifth dorsal ray, 
extending beyond the anal opening; adipose fin long, low, without trace of spine. 
Distance from tip of snout to base of first dorsal ray about 23 times in the total length, 
from base of last anal ray to the caudal about 4} times. 
The typical example described and figured by Dr. Steindachner is 75 mm. in total 
length. 
Andes of Ecuador. 
16. ARGES FISSIDENS, sp. 0. 
Arges whymperi (part.) Bouleng. Proc. Zool. Soc. 1890, p. 451. 
Length of head 5 times in the total length. Interocular width equal to the distance 
from eye to posterior nostril, 34 times in the length of head. ‘Teeth of the outer series 
of the preemaxillaries all bicuspid, more or less Y-shaped ; mandibulary teeth bicuspid ; 
barbel extending a little beyond the gill-opening. First dorsal ray nearly equal to the 
length of head; pectoral spine extending to anterior 5 of ventral; ventrals originating 
nearly below the first dorsal ray, extending 3—} of the distance from their base to the 
anal opening ; adipose fin long, low, without trace of a spine. Distance from tip of 
snout to base of first dorsal ray 54 times in the total length, from base of last anal ray 
to caudal 54 times. Uniform brownish. 
Total length 89 mm. 
‘Two specimens from the Andes of Ecuador, collected by Mr. Edward Whymper. 
17. Arces rest#. (Plate XXI. fig. 7.) 
Arges feste Bouleng. Bull. Mus. Torino, xii. 1898, no. 329, p. 9. 
Length of head 444% times in the total length. Interocular width equal to the 
distance from eye to posterior nostril, 34 times in the length of head. Nasal flap 
produced as a barbel. Lateral teeth of the outer series of the premaxillaries 
unicuspid (rarely bicuspid), median teeth bicuspid; mandibulary teeth bicuspid ; 
barbel extending beyond the gill-opening. First dorsal ray nearly as long as the 
head; pectoral spine extending to middle of ventral or beyond; ventrals originatitg 
below, or somewhat in advance of the first dorsal ray, extending ? of the distance 
