304 MR. C. TATE REGAN ON THE 
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3. FARLOWELLA OXYRHYNCHUS. 
Acestra oryrhynchus Kner, Denkschr. Ak. Wien, vi. 1853, p. 95, pl. vill. fig. 2; Giinth. Cat. Fish. 
vy. p. 261 (1864). 
Farlowella oxyrhynchus Bigenm. & Eigenm. Proc. Cal. Ac. (2) ii. 1889, p. 34, and Occ. Pap. Cal. 
Ac. i. 1890, p. 358. 
Length of head 32 times in the total length, distance from supraoccipital to base of 
first dorsal ray 54 times. Breadth of head 4 times in its length, diameter of eye 
15-16 times, interorbital width 5 times. Length of produced part of snout 24-5 
times in the distance from its tip to the anus, and 5-32 times as long as the postorbital 
part of head. Sides of head with bristles (?in males only). 34 scutes in a longitudinal 
series, 15+19; 8 between supraoccipital and dorsal; abdomen with a median series 
of plates between the lateral series. Outermost caudal rays elongate. Fins with or 
without dark spots on the rays; caudal with some large blackish spots, forming 1 or 2 
stripes on the upper lobe. 
Total length 225 mm. 
One specimen: Upper Amazon. 
4, FARLOWELLA KNERI. 
Acestra knerii Steind. Denkschr. Ak. Wien, xlvi. 1882, p. 26, pl. vii. fig. 1 ; Bouleng. Proc. Zool. 
Soc. 1887, p. 278. 
Farlowella knerii Rigenm. & Figenm. Proc. Cal. Ae, (2) ii. 1889, p. 34, and Occ. Pap. Cal. Ac. 1. 
1890, p. 358. 
Length of head 33-4 times in the total length, distance from supraoccipital to base 
of first dorsal ray 54 times. Breadth of head 33-33 times in its length, diameter ot 
eye 14-15 times, interorbital width 4} times. Length of produced part of snout 
32-34 times in the distance from its tip to the anus and nearly twice as long as the 
postorbital part of head. Sides of head without bristles. 33-34 scutes in a longi- 
tudinal series, 154+18-19; 7-8 between supraoccipital and dorsal; abdomen with 
a median series of plates between the lateral series. T'in-rays with dark spots: caudal 
with some large blackish blotches. 
‘Yotal length 190 mm. 
Three specimens: Amazons of Peru and Ecuador. 
5, FARLOWELLA ACUS. 
Acestra acus Kner, Denkschr. Ak. Wien, vi. 1853, p. 93, pl. viii. fig. 1; Giinth. Cat. Fish. v. p. 261 
(1864). 
Farlowella acus Figenm, & Kigenm. Proce. Cal. Ac. (2) ii. 1889, p. 34, and Occ. Pap. Cal. Ac. i. 
1890, p. 358. 
Length of head 4-4} times in the total length, distance from supraoccipital to base 
of first dorsal ray 5-5} times. Breadth of head 24-3} times in its length, diameter of 
