Excerpt: According to Klotz (1951), the range of Oarisma powesheik Parker (Figs. 1, 2) extends from Montana east to Iowa, Wisconsin, Northern Illinois, and Michigan. The first Michigan record was in Kent County made in 1893 by Wolcott who found it at Lamberton Lake. Later powesheik was collected by Newcomb in 1930, McAlpine in 1937 and 1963, Nielsen (1970) in 1963 and 1964, and Warczynski in 1968 at the same area. It was also taken at nearby Button Lake which flows into Lamberton Lake. In his list of Michigan Butterflies, Moore (1960) gave the fllght period as July 9-12, although, on the basis of present knowledge, 4-20 might be more accurate.
Holzman, Richard W.
"Eastern Range Extension for Oarisma Powesheik Parker (Lepidoptera: Hesperiidae),"
The Great Lakes Entomologist: Vol. 5
, Article 1.
Available at: http://scholar.valpo.edu/tgle/vol5/iss4/1