April, '10] HEADLEE : THE CORN EAR WORM 149 



area at once. In other words, it is not a migration, but an unusual 

 development due to favorable climatic conditions or to the absence 

 of natural enemies. 



President Britton : Doctor Hewitt will now present his paper on 

 the Larch Saw Fly. 



THE LARCH SAW FLY (NEMATUS ERICHSONII) 



By C. Gordon Hewitt, Ottawa, Canada 

 [Withdrawn for publication elsewhere] 



Mr. S. J. Hunter: The speaker, in introducing his remarlis, 

 stated that this species was parthanogenetic. I would like to know 

 upon what grounds he bases this statement. 



Mr. Hewitt: By the simple fact that no males were present, and 

 also from the fact that I have reared larvae from unimpregnated 

 females. 



Afternoon Session, Wednesday, December 29, 1909 

 Meeting called to order by President Britton at 1.00 p. m. 



President Britton : The next paper on the programme will be 

 presented by Mr. T. J. Headlee, Manhattan, Kansas. 



NOTES ON THE CORN EAR-WORM 



By Thomas J. Headlee, Manhattan, Kan} 



The fact that corn, which is one of the main sources of income to 

 the people of Kansas, has suffered a damage of about 3.5 per cent 

 to each of the last three crops through the ravages of this insect, 

 coupled with the acknowledged fact that no satisfactory method for 

 its control on corn has been devised, has compelled the writer to 

 plan a study of the com ear-worm for the purpose of finding how 

 it may be controlled. Undertaking the study of this problem was 



^ The writer desires to acknowledge the aid rendered him by his student 

 assistant, Mr. Walker McColloch, who under his immediate direction carried 

 out the details of this study, the practical results of which are recorded in this 

 paper. 



