Western Butterflies - A Peterson Field Guide
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by Paul Opler
Paperback: 256 pages ; 8.29" x 5.54" ; Houghton Mifflin Co.; Second Edition (1999)
This all-new edition includes more than 590 species, illustrated in lifelike positions on beautiful new color plates.
With descriptions of all the butterflies that occur west of the 100th meridian in the United States and Canada, this guide has accurate information on ranges, habitats, flight seasons, food plants, and more.
Brand-new color range maps and more than 100 color photographs accompany the species descriptions.