OF NORTH AMERICA. 129 



measurement, while the discal spots are ahvas present in my sj)ecimens 

 of A. virgo Linn., and but few expand less than 2 inches.'' 



"While, therefore, there is a probabilit}' that A. Saundersii \\a.ii the 

 species intended by Kirby, the unsatisfactory diagnosis, which contains 

 no comparative allusion to Linnaeus' species, renders it a matter of 

 uncertainty, and I prefer to refer Kirby 's description to A. virgo L. , 

 and to retain the name under which I have described it, for the second 

 smaller species" i^A. Saundersii). 



