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Baird's Butterfly
Butterfly.--This form, the male of which is represented in the plate, is the Western representative of P. asterias, and is characterized in general by the fact that the size is larger than that of asterias, and the postmedian band of yellow spots is broader. The female is generally darker and larger than that sex in asterias. Expanse, 3.25-3.50 inches.
Early Stages.--Not unlike those of P. asterias. The caterpillar feeds upon Umbelliferae.
The seat of this species or form is Arizona, whence it ranges northward.