COiYTEIVTS. 



Notes on the life history of Datana robusta Strecker. By W. S. Wuicin . . i 



Descriptions of nine new species of gnats. By Evelyn Groesiseeck Mitchell 7 

 Length of the life-cycle of Pseudophyrellia cornicina Fabricius for a single 



generation, with record of a parasite. By A. Arsene Giraui.t . . 15 



On North American and some Cuban Copelatus. By Chari.es Schae eer . 16 



New moths of the Family Geometridae. By John A. Gkossbkck ig 



Notes on Oncideres quercus Skinner. Bv G. Beyer ... 32 



Notes on Coccinellidae. III. By Charles W. Leng 33 



A new Cynipid from Arizona. By William Beutenmullek ... 45 

 Is mutation a factor in the production of vestigial wings among insects ? 



By Chari.es T. Brues 45 



Proceedings of the Society 53 



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