304 MR. C. TATE REGAN ON THE 



3. Farlowella oxtrhynchus. 



Arestra oxyrhynchus Kner, Denksclir. Ak. Wien, vi. 1853, p. 95, pi. viii. fig. 2; Giiutli. Cat. Fish. 



v. p. 261 (1861). 

 Farloivella oxyrhynchus Eigenm. & Eigenm. Proc. Cal. Ac. (2) ii. 1889, p. 34, and Occ. Pap. Cal. 

 Ac. i. 1890, p. 358. 



Length of head 3f times in the total length, distance from supraoccipital to base of 

 first dorsal ray 5^ 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 2f-3 

 times in the distance from its tip to the anus, and 3-3f 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. Denksclir. Ak. Wien, xlvi. 1882, p. 26, pi. vii. fig. 1 ; Bouleng. Proc. Zoul. 



Soc. 1887, p. 278. 

 Farlowella knerii Eigenm. & Eigenm. Proc. Cal. Ac. (2) ii. 1889, p. 34., and Occ. Pap. Cal. Ac. i. 

 1890, p. 358. 



Length of head 3§- 4 times in the total length, distance from supraoccipital to base 

 of first dorsal ray 5^ times. Breadth of head 3-g— 3f times in its length, diameter of 

 eye 14-15 times, interorbital width 44; times. Length of produced part of snout 

 3-§-3f 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, 15 + 18-19; 7-8 between supraoccipital and dorsal; abdomen with 

 a median series of plates between the lateral series. Fin-rays with dark spots : caudal 

 with some large blackish blotches. 



Total length 190 mm. 



Three specimens: Amazons of Peru and Ecuador. 



5. Farlowella acus. 



Acestra acus Kner, Denksclir. Ak. Wien, vi. 1853, p. 93, pi. viii. fig. 1 ; Giinth. Cat. Pish. v. p. 261 



(1861). 

 Farloivella acus Eigenm. & Eigenm. Proc. 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 2|-3i times in its length, diameter of 



