Insect Epicuticle

Abstract

Alexander, Kitchene and Briscoe^{1, 2} have shown that the desiccation of many insects caused by inert dust insecticides is due to adsorption of the epicuticle wax film, which becomes discontinuous and allows of increased loss of water through the cuticle. Further, Wigglesworth^{3, 4} has demonstrated abrasion of the wax film and increased evaporation of water caused by the application of an inert dust. It is evident, however, that insects differ conside ably with regard to the epicuticle, for nymphs of Rhodnius are unaffected by adsorption but are susceptible to abrasion³, whereas Tenebrio and other larvæ are more susceptible to adsorption than to abrasion¹.