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Photo#1137839
Need I.D Help - Pontia occidentalis

Need I.D Help - Pontia occidentalis
Mayfair, Saskatoon, Saskatchewan, Canada
September 10, 2015
I spent an hour trying to decide if this was a Western White or a Checkered White butterfly. Can someone help? There are lots of Pontia species in my neighbourhood right now but I don't know if they are all one species of Pontia or a variety. This individual was happily nectaring on the wild mustard in my garden.

Moved
Moved from Checkered Whites.

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