eigenmann: pimelodella and typhlobagrus 233 



a. 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. laliceps Eigenmann. 

 jj. Maxillary barbel extending to end of ventral or middle of anal. 



15. ausiralis Eigenmann. 

 Hi. D. 1.6; interorbital smaller than the eye, except in one specimen of itapicuru- 

 ensis. 



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. 



I. 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 Eigenmann. 



II. 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. metm Eigenmann. 



III. 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. 



?i. 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; p basal 



light bar through it IS. boliviana Eigenmann. 



mm. Maxillary barbel extending to or beyond the origin of the anal. 



0. 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 fulcrum 3.2 in the length; width of occipital process 

 3 in its length; pectoral spine with 14 very strong graduate 



