CONTENTS OF THIS NUMBER. 



Chamberlin, Ralph V. — Diplopoda from the Western 



States 233 



Haseman, L. — The Structure and Metamorphosis of 

 the Alimentary Canal of the Larva of Psychoda 

 Alternata Say 277 



Wilson, H. F. — A Key to the Genera of the Subfamily 



Aphidinae and Notes on Synonomy 314 



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