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CONTENTS 



Page 

 Notes on the host plants and parasites of some North American Bruchidae 



R. A. Cushman 489 



Scale insect parasitism in California H.J. Quayle 510 



Test sprayings for the gloomy scale, Chrysomphalus tenebricosus Comst. 



Z P. Metcalf 515 



The Pyralid, Omphalocera dentosa Grotc, a pest of barberry hedges 



W. E. Britton 521 



Insects of the year 1911 in Iowa R. L. Webster 524 



Methods of determining the toxicity of hydrocyanic acid gas G. A. Coleman 528 



Carbon disulfide explosion from heated corn W. E. Hinds 532 



Prehminary report of the committee on entomological investigations 



E. D. Sanderson 536 



Vacation notes in the Adirondacks W. E. Britton 544 



New species of gall midges E. P. Felt 546 



Two new aphids from Cahfornia W. M. Davidson 559 



Scientific Notes 



The cotton moth in Connecticut W. E. Britton 562 



Editorial 563 



Reviews 564 



Current Notes 567 



