The upper surfaces of the wings of the adult grasshopper Melanoplus sanguinipes bear long, medium, short, and minute innervated trichoid hairs, and campaniform sensilla. There are 2.2 times more of these sensilla, and their density is 5.8 limes greater on the fore wings than on the hind wings. They are concentrated along the primary longitudinal veins, and at the tips of both wings, and at the base and along the leading edge of the hind wing. These sensilla could possibly provide a feedback mechanism towards a coordinating role in flight, and a proprioceptor role in wing folding and unfolding.Possible chordotonal organs, multipolar neurons of type II, and an unidentified sensillum were noted also, but their number, distribution, and functional roles were not studied.