The equation of Leucania's migratory flight was studied primarily according to the principle of insect-ecology and kinematics. Thus the relationship between the vertical motion of atmosphere and the ascending and the descending movement of Leucania has been explained further in the article. A good deal of calculations for vertical motion in lower atmosphere layer in the appearance area of Leucania separata Walker have been done with the equation of coutinuity. The results showed once again that the upward c...