Abstract
Hygro-receptive sensilla have been found on the antennae of fruit flies (1), spider beetles (2), cockroaches (3), wireworms (5), ticks (6), mealworm beetles (8), flour beetles (11), and body lice (16). Two types of antennal sensilla, the basiconic and the coeloconic, have been identified as hygro-receptors of the grasshoppers, Melanoplus differentialis (Thos.) and M. mexicanus mexicanus (Sauss.) (12, 13). This paper describes the antennal sensilla of Melanoplus bivittatus (Say) and discusses their function.