PSYCHE 



A JOURNAL OF ENTOMOLOGY 



Established in 1874 



VOL. XVIII 



APRIL, 1911 



NUMBER 2 



Prodryas persephone Scudder. 



CONTENTS 

 A Revisiou of the North American Species of the Dipterous Genus 



Hydrophorus. J. M. Aldrich 45 



The Dipterous Genus Diostracus Loew. /. M. Aldrich. ... 70 

 Notes on the Dipterous Genera Proposed by Billberg in his Enum- 



eratio lusectorum. C. W. Johnson 73 



Another Imported Clover Weevil. E. G. Titus .... 74 



On the Later Embryological Stages of the Head of Pristhesancus 



papuensis. F. Muir and /. C Kershaw ...... 75 



The Food Habits of Megarhinus. Frederick Knab .... 80 



Stridulation of the Shield-backed Grasshoppers of the Genera 



Neduba and Aglaothorax. C. Pemberton 82 



A New Species of Lasioptera with Observations on Certain Homo- 

 logies. E. P. Felt 85 



Two New Species of Holcaspis from Mexico. Wm. Beutenmuller 87 

 Notes on Some Genera of Blattidae. A. N. Caudell ... 89 



Lucilia sericata as a Household Pest. ^-1. P. Morse .... 90 



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