CONTENTS OF THIS NUMBER. 



Calvert, P. P. — An Bntomologist in Costa Rica.. i 



Zetek, James. — Determining the Flight of Mosquitos. 5 

 Van Duzee, M. C. — A Revision of the North American 

 Species of the Dipterous Genus Neurigona. (Doli- 



chopodidse.) 22 



Betten, Cornelius. — An Interesting Feature in the 

 Venation of Helicopsyche, the Molannidae, and the 



Leptoceridae 65 



FuNKHOUSER, W. D. — Homologies of the Wing Veilis 



of the Membracidae 74 



Metcalf, Z. p.— The Wing Venation of the Jassidse. . 103 

 Tower, D. G. — A New Hymenopterous Parasite on 



Aspidiotus Perniciosus Comst . . . ., 125 



Entomological Society of America 127 



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