Characidae. 
oak § 
. S | 
Bryconamericus peruanus (Muller & Troschel). 
Head 3: 
reys rarely 26, 1, branched rays rarely 25; scales 
in lateral line 34 to 37 to caudal base and 4? more on lat- 
Y scales above 1. 1. to dorsal origin, 6 or 7 below to 
origin; 16 to 18 predorsal scales; snout 4 to 4 1/5 in 
from upper jaw tip: eye 3 1/5 to 4 1/8: maxillary 2 1/5 
v7 
1/3; interorbital 2 2/5 to 3. 
Body elongate, well compressed. Head wid 
its length. Snout width 3/5 its length. 
about midway in head length. Mouth with 
mandible protruding. Inner premaxillary 
each side. Maxillary nearly vertical to front eye édge, 
terminal half free from preorbital and 3 small inner teeth. 
Mandible with 4 large teeth each side in front followed sud- 
