CONTENTS 



New Neotropical Species of Ensign-flies or Evaniidae 



(Hymenoptera) . By Theodore H. Frison 1 



(Issued July 22, 1922.) 



Notes on Certain Species of Melanostoma (Diptera; 



Syrphidae). By W. M. Davidson 35 



(Issued July 25, 1922.) 



New Genera and Species of Melanopli found within the 

 United States and Canada (Orthoptera; Arcididae) 



By Morgan Hebard 49 



(Issued July 2.5, 1922.) 



New Species of Coleoptera of the Tribe Clerini, with Notes 



on Others. By A. B. Wolcott 67 



(Issued July 25, 1922.) 



The Genus Xiphandrium Loew in North America (Diptera; 



DoUchopodidae). By M. C. Van Duzee 79 



(Issued July 25, 1922.) 



