Fishing Spider with Egg Sac

Spider from Connecticut
I know you are busy this time of year, but I found this spider (the second one in three days) in my year in Northwest Connecticut. A couple of things, could you tell me what kind it is and what is the thing underneath it. Was it feeding or is it something else? Thanks for your help. Attached find a macro photo of one of the spiders.
Jim Shannon
Winsted, CT

Hi Jim,
This is a female Dolomedes Fishing Spider and she is carrying about her Egg Sac in order to protect it from harm. These large frightening spiders are quite harmless, and in addition to their maternal instincts, they are fascinating creatures.

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