Silver-spotted Skipper (Epargyreus clarus)
Silver-spotted Skipper Epargyreus clarus Iowa
Silver-spotted Skipper Epargyreus clarus Iowa
Silver-spotted Skipper Epargyreus clarus Iowa
Silver-spotted Skipper butterfly, (Epargyreus clarus) sharing a residential garden with several Tiger Swallowtails in Burlington (top and middle) and Geode State Park (bottom), in Iowa.

Details: 

(Top & Middle)  Canon EOS 10D,  shutter 1/250 second, aperture f13, ISO 400, Canon EF 100 mm macro lens, no flash.

(Bottom) Canon EOS 10D,  shutter 1/180 second, aperture f11, ISO 400, Canon EF 100 mm macro lens, Canon MR-14EX flash.
 

Selected References:

Brock Jim P., Kaufman Kenn. Butterflies of North America. New York: Houghton Mifflin Company, 2003. P 256-257.

Struttmann Jane M. USGS Northern Prairie Wildlife Research Center. "Silver-spotted Skipper (Epargyreus clarus (incl. huachuca))." Butterflies of North America / Butterflies of Iowa. <http://www.npwrc.usgs.gov/resource/distr/lepid/bflyusa/ia/607.htm > (15 Sep. 2004).