Abstract
Histological study of embryos of Melanoplus differentialis and Locusta migratoria showed the structure of the two embryonic cuticles and the nymphal cuticle of each species and the exact time of embryonic molts. The two embryonic molts of M. differentialis were analyzed experimentally by isolating in hanging drops 283 whole embryos, 103 anterior halves, 98 posterior halves, and 497 metathoracic legs. Both of the embryonic molts occurred in the majority of posterior halves explanted 7 days before the first molt. Most of the isolated legs completed one embryonic molt, and some of them continued developing normally through the second molt. The neuroendocrine system of the head and prothorax is not necessary for the control of either of the embryonic molts of M. differentialis. Embryonic development is independent of nervous or endocrine centers in the head, thorax, or abdomen. The coordination and control of embryonic molting in this species seems to lie in the epidermal tissue.
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