Milbert's Tortoiseshell, Aglais milberti (Lepidoptera: Nymphalidae): A facultative trogloxene in alpine caves

1Illinois Natural History Survey, University of Illinois, 1816 S Oak St., Champaign, IL 61820 USA. Email: sjtaylor@illinois.edu 2Zara Environmental LLC, 118 W. Goforth Rd., Buda, TX 78610 USA. Email: jean@zaraenvironmental.com 3The Nature Conservancy, 601 North University Avenue, Little Rock, AR 72705 USA. Email: mslay@tnc.org 4Department of Entomology, University of Illinois, 320 Morrill Hall, 505 S. Goodwin Ave., Urbana, IL 61801 USA. Email: tharriso@illinois.edu