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Pieris rapae
The Small White (Pieris rapae) is a small- to medium-sized butterfly species of the Yellows-and-Whites family Pieridae. It is also known as the Small Cabbage White and in New Zealand, simply as White Butterfly.[1] The names "Cabbage Butterfly" and "Cabbage White" can also refer to the Large White.
It is widespread and populations are found across Europe, North Africa, Asia, and Great Britain. It has also been accidentally introduced to North America, Australia and New Zealand where it causes damage to cultivated cabbages and other mustard family crops. The caterpillar stage alone is responsible for crop damage because of which it is referred to as the Imported Cabbageworm.-Wikipedia
Considering the extension of the "black" (on the dorsal view) triangle at the apex of the forewing it is a "borderline" to Pieris brassicae (Large White). However Brassicae is not (yet) found in America, so it must nevertheless be Pieris rapae.