EIGENMANN: PIMELODELLA AND TYPHLOBAGRUS 233 
vi. D. 1.6 or 1.7; interorbital 3-3.5 in the head; adipose 4-4.3 in the length; 
barbels reaching tip of the depressed dorsal or middle of anal; pectoral 
spine equals head without opercle, its posterior face smooth on the distal 
four-tenths, 10 or 11 small thorns on the proximal six-tenths. 
j. Maxillary barbel reaching tip of depressed dorsal. 
14. laticeps Kigenmann, 
jj. Maxillary barbel extending to end of ventral or middle of anal. 
15. australis Kigenmann. 
iti. D. 1.6; interorbital smaller than the eye, except in one specimen of itapicuru- 
ensts. 
k. Dorsal with a black wedge entering the fin from the middle in front, 
or with a hyaline base followed by black and shading to the tip of 
the fin. 
1. Maxillary barbel reaching middle of caudal; pectoral spine a little 
longer than snout and eye, with very few feeble teeth on its pos- 
terior face; adipose 3 in the length; interorbital 3.5-4 in the head. 
16. notomelas Kigenmann. 
ll. Maxillary barbel reaching anal; pectoral spine equals snout and 
eye, the dorsal spine equals snout and half the eye; adipose 3-3.25 
in the length; interorbital 4-5 in the head.. .17. mete Eigenmann. 
lil. Dorsal with a black blotch on its middle anterior portion; maxillary 
barbel extending to middle of ventrals or to near anal; adipose 
3.6-4 in the length; eye 4.5-5 in the head, interorbital about 
equal to the eye; upper caudal lobe the longer. See No. 26, meeki 
Eigenmann. 
kk. Dorsal without a black blotch, its tip usually dark. 
m. Maxillary barbel extending to near base or beyond tip of caudal; 
interorbital 3.5-4.7 in the head. 
n. Pectoral spine equals head less opercle, with 12-21 strong teeth 
on the posterior face; adipose 3.66 in the length; interorbital 
3.75 in the length of the head; length of adipose equals its 
distance from the dorsal spine or very little more; anal 
extends to or beyond tip of adipose. See No. 28, mucosa 
Eigenmann. 
nn. Pectoral spine a little longer than snout and eye, with 7 scarcely 
perceptible teeth on its posterior face. Adipose 3 in the 
length; interorbital 4.3-5 in the head; dorsal dark; a basal 
light bar through it..............18. boliviana Eigenmann. 
mm. Maxillary barbel extending to or beyond the origin of the anal. 
o. Maxillary barbel extending beyond tip of anal; pectoral 
spine equals head without opercle; width of head equals 
snout and eye. Eye 3.25 in the head; snout a little 
longer than postorbital portion of head; interorbital 5.5 
in the length of the head; distance between snout and 
dorsal fulerum 3.2 in the length; width of occipital process 
3 in its length; pectoral spine with 14 very strong graduate 
