North American Fauna, No. 16. 



Plate III. 



2 

 O 



w o 



w < 



O 2 



^ o 



?^ o 

 > 



Si 



r m 

 w ^ 



JO ^ 



G 



a 

 > 



Z 



d 



o 



r 

 > 



O 



:a 



M 



M 



. ?^ 

 w 



