Brown Stink Bug (Euschistus servus)
Brown Stink Bug (Euschistus servus), Big Hollow Recreation Area
This appears to be a brown stink bug nymph on a wild flower at Big Hollow Recreation Area in Des Moines County, Iowa. In the absence of a dorsal (back) view the identification is not conclusive. Stink bugs are classified as a crop nuisance

Details: 

Canon EOS 10D,  shutter 1/200 second, aperture f27, ISO 200, Canon EF 100 mm macro lens, Canon MR-14EX flash.
 

Selected References:

Borror Donald J, White Richard E. A Field Guide to Insects. New York: Houghton Mifflin Company, 1970. P 126-127.

Iowa State University. Department of Entomology. "True Bugs." Entomology Image Gallery. (http://www.ent.iastate.edu/ ) <http://www.ent.iastate.edu/imagegal/hemiptera/ > (24 Jun. 2005).

Milne Lorus, Milne Margery. National Audubon Society Field Guide to Insects & Spiders. New York: Alfred A. Knopf, Inc., 1980. P 483-484.