June, '21] . ressler: pyrausta ainsliei 277 



whether purple moths were present with them or not, and these eggs 

 always developed normally when both sexes were present. When 

 gray females were confined alone they deposited infertile eggs in some 

 cases. Some gray females deposited eggs which gave rise to both gray 

 and purple moths, ia one large brood in about equal numbers; others 

 had only gray progeny. 



Bibliography 



1868. Riley, C. V. : First Rept. State Ent. Mo. 



1878. French, G. H. : 7th Rept. State Ent. 111., pp. 94, 211. 



1883. LiNTNER, J. A. : 5th Rept. State Ent. N. Y., pp. 200-216. 



1890. Forbes, S. A. : 16th Rept. State Ent. 111., pp. 93-94. 



1895. Slingerland, M. V. : Cornell Bull. 104, pp. 579-584. 



1899. Lugger, O. : 4th Ann. Rept. Minn. Exp. Sta., p. 160. 



1901. Chittenden, F. H. : U. S. Bu. Ent., n. s.. Bull. 27, pp. 114. 



1901. Chittenden, F. H. : U. S. Bu. Ent., n. s.. Bull. 29, pp. 46-64. 



1901. Doane, R. W., and Brodie, D. A. : Wash. Exp. Sta., Bull. 47, pp. 3-16. 



1901. Fletcher, J. : Rept. Canada Ent. for 1900, pp. 215-227. 



1902. Stedman, J. M. : 34th Rept. Mo. Bd. Agr., pp. 118-124. 

 1904. Garman, H. : Ky. Exp. Sta., Bull. 114, pp. 34-35. 



1907. Forbes, S. A. : 23rd Rept. State Ent. 111., pp. 23-25, and p. 243. 



1912. 'Davis, 27th Rept. State Ent. 111., pp. 84-88. 



1913. State Ent. of Nebr., Bull. 1, pp. 35-41. 

 1915. Canada Dept. Agr.. Ent. Bull. 10. pp. 17-20. 



Adjournment. 



LIFE HISTORY OF PYRAUSTA AINSLIEI HEINR. 

 AT AMES, IOWA, DURING THE SEASON OF 1920 



By. I. L. Ressler, Iowa Slate College, Ames, Iowa 



Since the introduction of the European Corn-borer into the United 

 States there has been much discussion as to the consequence should 

 this pest appear in the com belt. This led to the study of the life his- 

 tory of Pyrausta ainsliei Heinr., a native borer (smartweed stem-bor- 

 er), as one of the projects of the Iowa Agricultural Experiment Sta- 

 tion at Ames. The larvae and adult females of P. ainsliei so closely 

 resemble the larvae and adult females of P. nubilalis Hubner (the Eu- 

 ropean Corn-Borer) that the two are easily confused.^ 



Injury 

 The writer has not observed the work of the insect in com, since it 



