Yesterday I walked the lower fields at Surrenden Farms conservation for a couple hours. It was sunny, hot and humid and the only butterflies flying out in the sunny fields were Pierids, a Monarch and a Baltimore Checkerspot. The rest were in the shaded areas at the edge of the woods.
Here's the list in taxonomic order using the MBC checklist.
Cabbage White 30+
Clouded Sulphur 12
American Copper 3
Eastern Tailed-Blue 3
Pearl Crescent 1
Baltimore Checkerspot 1
Little Wood Satyr 1
Monarch 1
Least Skipper 1
Little Glassywing 1
Tom Murray
Groton, Ma.