Abstract
Numerous studies have shown that the cuticle of insects is complex and highly-differentiated and that the complexity varies from species to species (2, 8, 11, 13, 14, 17, 18). The object of this study is to determine cuticular relationships between the grasshopper, Melanoplus bivittatus, and other insects already studied. This work was carried out by means of chemical tests and permeability measurements on fresh material rather than by methods of fixing and sectioning.