Pieridae, Pierinae, Pierini, Ascia monuste. Note the blue antenna tip and the yellow spot on the hindwing. This cannot be Pieris rapae. But New York is quite an unusual location for Ascia monuste. Please, check again the position of the lag on your map.
http://en.wikipedia.org/wiki/Ascia_monuste
http://www.butterfliesandmoths.org/species/Ascia-monuste
http://bugguide.net/node/view/3554/bgimage?from=0
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