168 OSTARIOPHYSI, 
2. Piabucina festz. 
Piabucina feste, 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. Anal1l. 28 scales in a longitudinal series. Deep olive-brown 
above, whitish below; fins greyish. 
Hab. Panama, Rio Sabina. 
Length of the type, 160 mm. 
3. LUCIOCHARAX. 
Luciocharax, Steind. Denkschr. Ak. Wien, xxxix. 1878, p. 67; Jord. & Everm. Bull. U.S. Nat. Mus. 
xlvii. 1896, p. 339. 
A single species from Panama and Colombia. 
1. Luciocharax insculptus. 
Luciocharaz insculptus, Sted. Denkschr. Ak. Wien, xxxix. 1878, p. 67, t. 13. fig. 2', and xli. 1879, 
p. 169°; Jord. & Everm. Bull. U.S. Nat. Mus. xlvii. 1896, p. 339°. 
Depth of body 6 in the length, length of head 3. Dorsal 10. Anal 12. 44 scales in a longitudinal series. 
Silvery, back greyish; a dark spot at the base of caudal. 
Hab. Panama, Rio Mamoni*.—Cotomsia, Rio Magdalena !. 
Total length 300 mm. 
4. BRYCON. 
Brycon, Mill. & Trosch. Hor, Ichthyol. i. p. 15 (1845); Giiuth. Cat. Fish. v. p. 333 (1864); 
Jord. & Everm. Bull. U.S. Nat. Mus. xlvii. 1896, p. 337. 
Chalcinopsis, Kner, Sitzungsb. Bayer. Ak. 1868, p. 226; Giinth. t. c. p. 336. 
Numerous species from Central and South America. 
1. Brycon guatemalensis, sp. n. 
Yhalcinopsis dentex (part.), Giinth. Cat. Fish. v. p. 837 (1864) *, and Trans. Zool. Soc. vi. 1868, 
p. 478, t. 82. fig. 1°. 
Depth of body 2? to 3 in the length, length of head 43 to 43. Snout longer than eye, the diameter of which 
is 43 to 53 in the length of head ; interorbital width 2 to 23 in the length of head. Maxillary extending 
nearly to below middle of eye; lower jaw a little shorter than the upper; premaxillary teeth in 4 series. 
13 to 15 gill-rakers on the lower part of the anterior arch. 52 to 56 scales in a longitudinal series, 10 
between dorsal fin and lateral line, 5 or 6 between lateral line and root of ventral. Dorsal 11; origin 
behind the ventrals; free edge straight or convex; longest ray as long as or shorter than the head. 
Anal 34-36, of 4 simple and 30 to 82 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. 
