80 



THE AMERICAN CHARACIDAE. 



Habitat. — Amazons and north to Guiana. 



I have examined the types of T. oligolepis and there is no doubt but that 

 they are identical with T. agassizii. 



Specimens examined. 



Head 3.64; depth 2.25 on an average; D. 11; anal most frequently 25 

 or 26 '; scales 5-30 to 31^4 2 . Eye 2.5-3 in the head; interorbital wider than 

 eye. 



Rather deep, compressed, especially above the anal; ventral profile some- 

 what more arched than the dorsal, no distinct humps or depressions, the out- 

 line subrhomboidal. Preventral area narrowly rounded or with an indistinct 

 median keel, no lateral keels except in the very largest; postventral area com- 

 pressed, with a median series of bent scales, the scales bordering it not much 

 smaller than those above it ; five scales from the median scale to the lateral line ; 



1 Of fifty-two specimens, two have twenty-three, six have twenty-four, nineteen have twenty-five, 

 fourteen have twenty-six, ten have twenty-seven, and one has twenty-eight. 



2 Of fifty specimens among those in the M. C. Z., six have twenty-nine, twenty-five have thirty, 

 sixteen have thirty-one and three have thirty-two scales in the lateral line. 



