The distribution of butterflies is strangely local with many species. Not having sufficient data at hand to justify an attempt to catalogue the butterflies of this locality, I am led to offer a list of a few species that are so seldom seen here as to make it unlikely that they would be taken by one making a study of only a few weeks' duration.
Proceedings of the Iowa Academy of Science
©1914 Iowa Academy of Science, Inc.
Pellett, Frank C.
"Butterflies of Chance Occurrence in Cass County, Iowa,"
Proceedings of the Iowa Academy of Science, 21(1), 347-348.
Available at: https://scholarworks.uni.edu/pias/vol21/iss1/45