18 - 
eye, but never reaching the gill-openings. Mental bar¬ 
beis extencling to gill-openings ; postmental barbei rnueh 
shorter, equaling in length 1 interorbital space. Jaws 
subequal. The lower one somewhat shorter. Teeth as 
usual, forming bands like those in Rhamdia. 
Distance from base of dorsal spine to tip of snout 
2 % in length; dorsal fin, rather shorter tlian high, 
its base a little shorter than snout; first dorsal ray weak 
and smooth, shorter than the 3 or 4 next rays. Highest 
fin equal to snout and eye. Distance from dorsal to adi- 
pose equal to the length of the latter and the distance 
from tip of snout to end of opercle. Adipose fin very 
low in the first J/ 3 , increasing posteriorly in hight, but 
not attaining a hight more than lialf an interorbital. 
Distance between adipose and base of caudal about % 
of the length of adipose. 
Caudal deeply cleft; the upper-lobe somewhat shorter 
than the adipose and by J/£ ou bs longer than the lower 
one. Anal a little rounded; the longest ray about % 
of lenglit of base; its base almost 1 ocular diameter 
longer than snout and eye; the first ray below the be- 
ginning of adipose. Ventrals inserted below end of dorsal, 
rounded ; the longest rav equals tliat of the dorsal. 
First pectoral inserted between the middle of tip 
of snout and base of ventral, or a little before. First 
pectoral weak at its tip; only the younger specimens 
showing closely set liooks on the interior margin. Outer 
margin always smooth. First ray J/J shorter than the 
next ones. 
