UCDavis - Western USA - Monarch Butterflies - 1892-2005

Monarch (Danaus plexippus) species occurrence data collated for western North America from museum and private databases and specimen labels. The data sources included collections from the Nevada State Museum (George Austin), Brigham Young University, the California Academy of Sciences, the Los Angeles County Museum of Natural History, the Bohart Museum (University of California, Davis), the University of Utah and Utah State University. Additional data sources were collections and observations from John Hinchliff ’s Oregon Butterfly Atlas (via Oregon State University), Andrew Brower, Robert Pyle, Arthur Shapiro and Larry Speers.