New Facts regarding the Phases of Migratory Locusts

Abstract

THE work on Locusta migratoria L., which was published in Russia 1912–14, has been regarded by most entomologists as throwing an important new light on the origin of locust swarms. According to the Russian entomologists, two species, Locusta migratoria L. and Locusta danica L., are to be regarded as forms of the same species, differing in habits, yet intimately related, in that the two forms may emerge from the same egg-mass, occur in the same hopper swarms, and, as was demonstrated by laboratory experiments, can, by suitably altering the conditions, be changed from one form to the other.