THE MYKIAl'OUA OF NORTH AMERICA. 



157 



TABLE SHOWING THE VARIATIONS IN SOME OF THE MORE IMPORTANT SPECIFIC CHARACTERS. 



* The numbers in this column refer to the Smithsonian Collection. 

 f This is probably a very young individual of this species. 



I The last legs of this specimen are evidently a'reproduced pair. 



§ Apparently a reproduced pair of dental lamina, as the teeth are not developed. 



| The spines on this individual are smaller than common. It is a curious variation. 



