FISHES OE THE FAMILY LOEICABIIDiE. 303 



Diameter of eye 12i times in the length of head; length of postorbital 



part of head 3| times in that of the produced part of snout . . 2. F. gracilis Bgn. 

 b. Distance from supraoccipital to base of first dorsal ray 

 5^ times in the total length. Diameter of eye about 



16 times in the length of head 3. F. oxyrhynchus Kner. 



B. Length of produced part of snout 3§-3f times in the 

 distance from its tip to the anus ; distance from supra- 

 occipital to first dorsal ray 5£ times in the total length . 4. F. hieri Stdr. 

 II. Abdomen without median series of plates, except 1 or 2 anteriorly. 

 Length of produced part of snout 4-4£ times in the distance from its 



tip to the anus 5. F. acus Kner. 



Length of produced part of snout 3 times in the distance from its tip 



to the anus 6. F. amazonum Gthr. 



Length of produced part of snout 2^-2i times in the distance from its 



tip to the anus 7 . F. gladiolus Gthr. 



1. Farlowella gladius. 



Acestra gladius Bouleng. Trans. Zool. Soc. xiv. 1897, p. 425, pi. xli. fig. 2. 



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

 of first dorsal ray 6 times. Breadth of head 4 times in its length, diameter of eye 

 18 times, interorbital width 5 times. Length of produced portion of snout (measured 

 on the ventral surface from the edge of the naked area containing the mouth) 3 times 

 in the distance from its tip to the anus, and 2-f times as long as the postorbital part of 

 head. Sides of head without bristles. 33 scutes in a longitudinal series, 14+19 ; 

 7 between supraoccipital and dorsal ; abdomen with a median series of plates between 

 the lateral series. Outer caudal rays strongly produced. AIL the fin-rays with dark 

 spots ; caudal with a longitudinal blackish stripe on its upper lobe. 



Total length 210 mm. 



Two specimens : R. Jurua. 



2. Farlowella gracilis, sp. n. (Plate XX. fig. 3.) 



Length of head of times in the total length, distance from supraoccipital to base oi first 

 dorsal ray 6^ times. Breadth of head 4 times in its length, diameter of eye 12-ir times, 

 interorbital width of times. Length of produced portion of snout 3 times in the 

 distance from its tip to the anus and of times as long as the postorbital part of head. 

 Sides of head with short bristles ("? in males only). 33 scutes in a longitudinal series, 

 15 + 18. In other characters similar to the preceding species, which it resembles in 

 coloration. 



Total length 190 mm. 



One specimen : Rio Caqueta, Cauca Valley, S. Colombia, collected by Dr. M. 

 D. Eder. 



vol. xvn. — part in. No. 15. — October, 1904. 2 s 



