Distinguishing Northern Pearl Crescents from Pearl Crescents

[Roger Kuhlman]

I live in an area where both the Pearl Crescent (Phyciodes tharos) and 
the Northern Pearl Crescent (Phyciodes selenis) are known to fly. What 
are some identifying features to look for to separate the two species? 
I have heard that distinguishing the two species is real difficult. Most 
everything I have seen flying in Washtenaw county this year I think are 
Pearl Crescents but some of the larger specimens I wonder about. It 
would sure would be nice to know how common the Northern Pearl Crescent 
has been in the past in Washtenaw and its adjacent counties. 

Roger Kuhlman
rkuhlman at hotmail.com
Ann Arbor, Michigan
7-2-98

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