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Re: > Does anyone know if you really can tell from Mustard with just  
upperside? 
 
   I think that the hind wing shape difference 
of West  Virginia Whites and Mustard Whites 
is much easier to use for identification  
than the forewing shape as suggested elsewhere.

Various  illustrations, and especially the one of each 
species I netted during the  atlas in Grand Isle,
show the difference in hind wing shape. 

D Hoag,  Grand Isle