168 OSTAElOPHTSr. 



2. Piabucina festae. 



Piabucina festcE, Bouleng. Boll. Mus. Torin. xiv. 1899, No. 346, p. 1 ' : Jord. & Everm. Bull. U.S. 



Nat. Mus. xlvii. 1900; p. 3145 -. 



Depth of body 4 in the length. Dorsal 9. Anal 11. 28 scales in a longitudinal series. Deep olive-brown 

 above, whitish below ; fins greyish. 



Hah. Panama, Rio Sabina. 



Length of the type, 160 mm. 



3. LUCIOCHABAX. 



Luciocharax, Steind. Denksclir. Ak. AVien, xxxix. 1878, p. 67; Jord. & Everm. Bull. U.S.Nat. Mus. 

 xlvii. 1896, p. 339. 



A single species from Panama and Colombia. 



1. Luciocliarax insculptiis. 



Luciocharax 'mscidptus, Steind. Deukscbr. Ak. Wien, xxxix. 1878, p. 67, 1. 13. tig. 2 \ and xli. 1879, 

 p. 169'; Jord. & Everm. Bull. U.S. Nat. Mus. xlvii. 189G, p. 339'. 



Depth of body 6 in. the leug(h, length of head 3. Dorsal 10. Anal VI. 41 scales in a longitudinal series. 

 Silvery, back greyish; a dark spot at the base of caudal. 



ITah. Panama, Rio Mamoni ". — Colombia, Rio Magdalena i. 

 Total length 300 mm. 



4. BRYCOX. 



Brycon, Miill. Ss Troscli. Hor. Iclithyol. i. p. 15 (1845) ; GtiutL. Cat. Fish. v. p. 333 (1864) ; 



Jord. & Everm. Bull. U.S. Nat. Mus. xlvii. 1896, p. 337. 

 Chalcinopsis, Kner, Sitzungsb. Bayer. Ak. 1863, p. 226; Giinth. t. e. p. 336. 



Numerous species from Central and South America. 



1 . Brycon guatemalensis, sp. n. 



Chalcinopsis clentex (part.), Giinth. Cat. Fisli. v. p. 337 (1864) ', and Trans. Zool. Soc. vi. 1868, 

 p. 478, t. 82. fig. 1 \ 



Depth of body 2| to 3g in the length, length of bead 4.| to 4|. Snout longer than eye, the diameter of which 

 is 4^ to bh in the length of head ; interorbital width 2 to 2* in the length of head. Maxillary extendijig 

 nearly to below middle of eye; lower jaw a little shorter than the upper ; iirtumaxillary teeth in 4 series. 

 13 to 15 gill-rakers on the lower part of the anterior aroh. 52 to 5(i scales in a longitudinal series, 10 

 between dorsal fin and lateral line, 5 or G between lateral line and root of ventral. Dorsal 11 ; origin 

 behind the vejitrals ; free edge straight or convex ; longest ray as long as or shorter than the head. 

 Anal 34-3G, of 4 simple and 30 to 32 branched rays ; origin below the middle of dorsal; anterior part 

 of fin deep and convex, middle part emarginate. Pectoral as long as or shorter than head, sometimes 

 reaching the ventrals, which do not extend to the anal. Caudal forked. Silvery ; some of the scales 

 with blackish edges, forming vertical streaks; posterior edge of gill-opening blackish ; a more or less distinct 

 blackish spot on the caudal peduncle ; anal usually dark-edged. 



