The following paper is a sequel to the writer's study of the head capsule and its appendages of Grylloblatta (Walker, ’31b) and is a contribution to the materials necessary to a final decision as to the systematic position of this primitive insect and the interrelationships of the various orthopteroid groups. It is our intention in future papers to discuss the other regions of the body in a similar manner and to withhold our final judgment on Grylloblatta's relationships until the study is completed.
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E. M. Walker (1933) studied this question.