Very similar to P. glaucus, except ventrally the hind wings lack marginal orange spots.(1)
Larvae very similar to those of Pale Tiger Swallowtail, but black pupil of false eye-spot larger, and yellow spot inside eyespot entirely separated from it, not just notched.
Western North America east to the edge of the Rocky Mountains.(1)
Woodlands and more open areas, often near streams. Also common in cities and suburbs due to the popularity of sycamores in landscaping.
June-July (one flight) in much of range, but much of year (2-4 flights) along Pacific coast.
Adults take nectar.
Males patrol canyons and hilltops. Larvae feed on foliage of deciduous trees, including cottonwood, birch, elms, willow, alder, sycamore, and aspen (1). They rest in shelters made of silk and curled leaves. Overwinters as pupa (chrysalis).
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