THE CYCLK OK I. IKK 



FIG. 4. 



DESCRIPTION OF FIG. 4. Various stages of the last molt of the yellow grasshopper 

 (Melanoplus differentiaiis). 7, nymph just before the breaking of the skin along back 

 of thorax ; 2, nymph beginning to come out ; 3, mature insect dropping to the ground ; 

 4, cast-off skin, still clinging to the leaf; 5, grasshopper climbing up, spreading wings 

 to dry, and getting ready to eat ; 6, fully developed grasshopper on corn-stalk. 



