11 LIST OF PAPERS 



Descriptions of One New Genus and Fifteen New 



Species of Tropical American Orthoptera . . 321 



(Issued November 20, 1918.) 



Rehn (James A, G.) and Hebard (Morgan) 



A Study of the North American Eumastacinae 



(Orthoptera; Acrididae) ..... 223 

 (Issued September 30, 1918.) 



Swain (Albert F.) 



New Aphididae from CaHfornia .... 1 



(Issued March 28, 1918.) 



Whedon (Arthur DeWitt) 



The Comparative Morphology and Possible Adapta- 

 tions of the Abdomen in the Odonata . . . 373 



(Issued January 6, 1918.) 



