The Southwestern Orangetip, Anthocharis thoosa, is native to the southwestern United States. It inhabits juniper, pinyon juniper, and pinyon woodlands from northern Nevada through Utah and western Colorado south to southeastern California , Arizona, New Mexico, and western Texas. Adult butterflies fly in the spring (January–May). Caterpillars feed on a variety of mustards, family Brassicaceae.
- Opler, P.A. 1999. A Field Guide to Western Butterflies. Second Edition. The Peterson Field Guide Series. Houghton Mifflin Company, Boston, New York.