Pieridae/Whites, Pierinae, Pieris sp. and most probably Pieris rapae.
http://bugguide.net/node/view/742020/bgimage
http://en.wikipedia.org/wiki/Pieris_rapae
Intersting observation of a late mating in autumn.
It is actually a butterfly, if you look at the clubbed antennae. And it is a female, probably the one in the front, and a male during mating. Moths usually have feathery-like or filamentous-straight antennae without clubs at the tip.
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