CONTENTS 



PAGE 



Insects Affecting Coffee in Porto Rico R. H. Van Zwalmoenburg 513 



A Demonstration in Mosquito Control C. W. Howard 517 



When Does the Cost of Spraying Truck Crops become Prohibitive, V. I. Safro 521 



A Device for Sowing Grasshopper Poison T. H. Parks 524 



New Parasite Cages C. E. Pemberton and H. F, WiUard 525 



The Biology of Coelinidea meromyzae Forbes E. 0. G. KeUy 527 



The Effect of Certain Chemicals upon Oviposition in the Housefly, Musca 



domestica S. E. Crumb and S. C. Lyon 532 



The Life-History of the Okra or Mallow Caterpillar, Cosmophila erosa Hubn. 



H. L. Dozier 536 



Notes on the Life Cycle of the Sugar-Beet Webworm H. 0. Marsh 543 



The Hop Redbug, Paracalocoris hawleyi Knight /. M. Hawley 545 



Amphiscepa hivittata in its Relation to Cranberry H. B. Scammell 552 



Studies on the Morphology and Susceptibility of the Eggs of Aphis avenae Fabr., 



Aphis pomi DeGeei &nd Aphis sorbi Kslt. Alvah Peterson 556 



Scientific Notes 660 



Editorial 564 



Current Notes 666 



