Experiments in Ed. Kelley orchard, Anna, Illinois, winter of 1924-25, 123 



The effect of cold winters on San Jose scale and scale sprays 12.5 



Summary and recommendations 125 



ARTICLE III. NOTES ON HOMOPTERA FROM ILLINOIS, WITH 

 DESCRIPTIONS OP NEW FORMS, CHIEFLY EUPTERYGINAE. 

 BY W. L. McATEE. Jri.v, 1926 127-136 



ARTICLE IV. A LIST OF THE INSECT TYPES IN THE COLLEC- 

 TIONS OF THE ILLINOIS STATE NATURAL HISTORY SUR- 

 VEY AND THE UNIVERSITY OF ILLINOIS. BY THEODORE 

 H. FRISON. Feuru.\ry, 1927 137-309 



Introduction 137 



Types in the Collection of the Illinois State Natural History Survey. 142 

 Types in the Andreas Bolter Collection of Insects (Natural History 



Museum, University of Illinois) 232 



Types in the A. D. MacGillivray Collection of Tenthredinoidea (De- 

 partment of Entomology. University of Illinois) 234 



Appendix [Concerning other MacGillivray types of Tenthredinoidea] 269 



Index [Indicating present status of names] 271 



ARTICLE V. AN EXPERIMENTAL INVESTIGATION OP THE RE- 

 LATIONS OF THE CODLING MOTH TO WEATHER AND CLI- 

 MATE. BY VICTOR E. SHELPORD. (35 T.usles; 34 Text-fig- 



fRES) March, 1927 311-440 



Introduction by Stephen A. Forbes 311 



Foreword 314 



Part I. Prediction procedure: 



The problem of predicting the appearance of the codling-moth.... 315 



Measurement of development 317 



Definition of the unit of development 318 



Procedure for predicting the time of emergence of moths 319 



The use of temperature data alone 324 



An example of estimation of seasonal progress 325 



Abundance of late-pupating larvae in spring 326 



Abundance of hibernated larvae as affected by weather of preced- 

 ing autumn and spring 327 



Part II. A basis for the measurement of development: 



Former methods of estimating progress in life-history stages 328 



Conditions affecting the rate of development 329 



Methods of measurement of factors 330 



Definition of terms 330 



Graphic representation of velocity 333 



Order of experimentation 337 



Interpretation of experimental data 337 



Calculation of standard time 338 



