Bumblebee (Bombus sp.)
Bumblebee (bombus sp.) on a flower at Geode State Park in Henry County, Iowa. Verification of the species was not possible.

Details: 

(Top)  Canon EOS 10D,  shutter 1/180 second, aperture f8, ISO 400, Canon EF 100 mm macro lens, Canon MR-14EX flash.

(Middle) Canon EOS 10D,  shutter 1/180 second, aperture f9.5, ISO 400, Canon EF 100 mm macro lens, Canon MR-14EX flash.

(Bottom)  Canon EOS 10D,  shutter 1/180 second, aperture f8, ISO 400, 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. Plate 16 P 360.