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Acastus
Butterfly.--With thinner and less robust wings than any of the species of the genus hitherto mentioned. It is prevalently fulvous upon the upper side, and on the under side of the hind wings heavily and somewhat regularly banded with yellowish-white spots, possessing some pearly luster. Expanse, male, 1.50 inch; female, 1.60 inch.
Early Stages.--Unknown.
Common in Nevada, Utah, and Montana.