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CONTENTS 



The Costa Rican Species of Epigomphus and Their Mutual 



Mating Adaptations (Odonata). By Phihp P. Calvert 323 

 (Issued Deceiriber 13, 1920.) 



New Genera and Species of Melanopli found within the 

 United States (Orthoptera; Acrididae). Part III. By 



Morgan Hebard 355 



(Issued December 14, 1920.) 



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