Memoirs Carnegie Museum, Vol, VII. 



Plate XXXVI, 



KNOWN DISTRIBUTION OF THE PYGIDIIN/E. 



^ Known distribution of Pygidium. Probably In all 

 mountain streams north of the latitude of Buenos 

 Aires and sporadically in lowlands. The localities in 

 Southern Chile not indicated. . 



Known distribution of Hatcheria. 

 Known distribution of Sc/er'onema. 

 Known distribution of Eremopkllus. 



