209 

 Comments 



Ageneiosus brevis was described by Steindachner from four specimens ranging 

 in length from 4 to 4.5 inches. Only two specimens (NMW 47801) from the original 

 type series were found in the present study. The larger of these (NMW 47801:1, 104 

 mm SL) is herein designated the lectotype, and the other specimen (NMW 47801:2, 

 95 mm SL) becomes the paralectotype. Both were collected from Coary ( = Coari), 

 Brazil, by Hyavary. 



Two syntypes of A. rondoni were examined (MNRJ 962); the larger of these 

 (160 mm SL) is designated the lectotype, and the smaller specimen (134 mm SL) the 

 paralectotype. 



In the original description of ^4. madeiremis, Fisher (1917) designated 13 

 paratypes; the paratypic series (FMNH 58144) presently has 14 specimens, however, 

 and I assume that either Fisher miscounted his specimens or there was a typesetting 

 error. 



The type specimens of T. alta were listed as from the Rio Maraiion, Iquitos, 

 Peru; the city of Iquitos, however, is not on the Rio Maraiion proper, and the 

 precise area from which these specimens were collected cannot be ascertained. 



Specimens oi Ageneiosus brevis examined in this study were relatively 

 variable in the number of anal-fin rays, gill rakers, and vertebrae, and also in the 

 presence of a postcleithral process, general body shape, and in coloration. At 

 present, I consider this variation to be intraspecific, since in some cases individuals 

 from the same collection exhibited extremes of polymorphism. No clearly defined 

 geographic differences could be found in these characters in the material examined. 

 With regard to the presence of a postcleithral process (PCP), I consider ^4. brevis to 

 be intermediate between Tetranematichthys, in which the PCP is invariably present, 

 and all other species oi Ageneiosus, in which it is consistently absent. Relative to 



