Western White
(Pontia occidentalis)
The Western White is a stray from the west that has only been found once in Wisconsin.
Identifying characteristics: White butterfly with extensive black or brown markings. The female has much more extensive markings. Like the Mustard White, this species has a spring form that has dark, greenish veins beneath.
Similar species: The Checkered White may be mistaken for a male Western White; look at the front wing marginal spots above. If there are 5–6 spots and these spots are much darker than the outer spots then it is could be a Western White; the Checkered White has only 2–3 of these spots.
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Western White
Pontia occidentalis