North American Butterfly Association
1 mile west of US route 1, on Mason/Dixon--MD/PA-19362
Chester County, PA
Overnight we had a powerful cold front move through and by dawn our temperature was 19° and all nectar sources succumbed overnight. At just after noon I saw a Clouded Sulphur on the wing and again like midday yesterday, temperature was at 37° in full sun and breezy conditions. After seeing the Sulphur I did scour the fields to no avail.
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