New Tingitidae (Hemiptera). Carl J. Drake pages 1-22

Abstracts of Doctorial Theses pages 23-162

The Psyllds of America North of Mexico (Psyllidae: Homoptera). Leonard D. Tuthill pages 443-657

Influence Of Some Soil and Cultural Practices On The Sucrose Content of Sugar Beets. G.C. Kent, C.M. Nagel, and I.E. Melhus pages 163-174

The Relation of Secondary Plant Succession to Soil and Water Conservation. Robert M. Warner and J.M. Aikman pages 175-190

Carotin-The Principal Pigment Responsible For Variations in the Coloration of the Adult Grasshopper, Melanoplus bivittatus Say. James McDonald Grayson and Oscar E. Tauber pages 191-196

Concerning The Rhopalidae (Hemiptera). H.H. Harris pages 197-204

Host and Seasonal Notes on the Rabbit Tick, Haemaphsalis leporispalustris. C.R. Joyce and Gaines W. Eddy pages 205-212

The Response of Some Field Crops on Soil Treated With Chlorpicrin. J. Harvey McLaughlin and I.E. Melhus pages 213-220

Morphology of the Digestive Tract of Cynaeus angustus Le C., A Tenebrionid. Jack Krall and David T. Jones pages 221-226

Studies on the Myxobacteria. J.M. Beebe pages 227-240

The Action of Organic Acids on Cornstalk Lignin. Elton Fisher pages 241-250

A Semi-Micro Method for the Determination of Reducing Sugars in Fermentation Media. L.A. Underkolfer, J.F. Guymon, M.M. Rayman, and Ellis I. Fulmer pages 251-256

Nature of Eimeria nieschulzi-growth-promoting Potency of Feeding Stuffs. V. Dry-Heating Ingredients of the Ration. E.R. Becker, M. Manresa, Jr, and L. Smith

Variability of Nigrospora on Maize. J.H. Standen pages 263-276

A Botanical Survey in the Lake Region of Clay and Palo Alto Counties. Ada Hayden pages 277-416

Breeding Records of Rats Fed Certain Diets Containing Meat. Pearl P. Swanson, Williamina E. Armstrong, and P. Mabel Nelson pages 417-430

Reduction in the Efficiency of Ablastic Action in Trypanosoma lewisi Infection By Withholding Panthothenic acid from the Host's Diet. E.R. Becker, M.Manresa, and Eleanor M. Johnson pages 431-442