Eigenmann: Collection of Fishes from Paraguay. 139 



color cells on upper part of cheek and opercle ; back and sides above 

 the lateral streak densely punctate, the margins of the cells blackish ; 

 a row of cells along the margin of the scales below the lateral streak ; 

 belly and breast colorless ; region above anal peppered ; a vertical 

 shoulder spot and a dark lateral streak; back of caudal peduncle punc- 

 tate, the peduncle otherwise without pigment except a narrow posterior 

 margin, which, together with the basal part of the caudal is jet black, 

 the band being about as wide as the eye and slightly oblique ; caudal 

 immediately behind the band without pigment ; tip of caudal and all 

 the other fins punctate. 

 70. Bryconamericus exodon Eigenmann gen. et sp. nov. 



Poecilurichthys dichrourus Eigenmann & Kennedy, in part, Proc. 

 Acad. Nat. Sci. Phila., 1903, 522 (Ascuncion). 



Type: No. 10298^, Indiana University Museum, a specimen 45 

 mm. long, over all. Puerto Max, J. D. Anisits. 



Cotypes : 10298, Indiana University Museum, 5 specimens. Puerto 

 Max. 



Cotypes: 10297, Indiana University Museum, 3 specimens, Ascun- 

 cion. 



Cotypes: 11 264, Indiana University Museum, 2 specimens, Ascun- 

 cion. 



The specimens differ from all other astyanaciform species I have 

 been able to examine in the position of the anterior teeth of the pre- 

 maxillary. I have both males and females and there are no apparent 

 secondary sexual differences. 



Head 4.4-4.33; depth 3.66-4; D. 9 or 10; A. 23-25; scales 

 5-39 or 40-4. Slender, tapering regularly from near the middle of 

 the pectorals to the caudal ; head blunt, mouth moderate, terminal ; 

 maxillary extending beyond origin of eye ; snout and maxillary not 

 quite 2.5 in head; maxillary not slipping under preorbital ; cheeks 

 covered by suborbitals ; interorbitals slightly convex, very little greater 

 than eye ; eye not quite 3 in head. 



Maxillary with two, three, or more pointed teeth ; premaxillary with 

 four, five, or more pointed teeth of the usual sort in the inner series ; 

 outer series consisting sometimes of five teeth in each premaxillary, 

 the second and fourth teeth withdrawn from the line of the first and 

 fifth and alternating with the space between the first and second and 

 third teeth of the inner series ; the anterior series thus form two 

 imperfect series. The first, third, and fifth teeth directed forward 



