EEPOET ON SOME OF THE INSECTS AFFECTING CEEEAL 



CEOPS. 



By F. M. Webster. 



LETTER OF SUBMITTAL. 



La Fayette, Ind., October 22, 1890. 

 Sir: I herewith submit my annual report of observations on some of the insects 

 affecting cereal grains. For assistance in carrying on the experiments connected 

 with the studies of the Hessian Fly, lam greatly indebted to the following gentlemen : 

 Hon. Samuel Hargrave, Princeton; Mr. W. S. Ratliff, Richmond; Mr. Miles Martin, 

 Marshall; Hon. W. Banks, La Porte, and Hon. J. N. Lakta, Hawpatch ; to Purdue 

 University, and later the experiment station. I am also under obligations for use 

 of land, seed, and labor in carrying out my own experiments here at La Fayette. 



To yourself especially, and others of the division, I am under many obligations for 

 the determination of specimens and other numberless favors. 

 Respectfully submitted. 



F. M. Webster. 

 Dr. C. V. Riley, 



U. S. Entomologist. 



THE HESSIAN FLY. 



Number and Development of Broods, 



My experiments, notes, and observations upon this insect extend 

 over a period of a little over six years, and while it received little more 

 attention than was given other wheat-destroying species, a considerable 

 number of facts have accumulated which, while not by any means 

 clearing up all of the mysteries of the pest, will nevertheless serve to 

 throw some light on several obscure points. Unless otherwise stated, 

 all of my observations and experiments herein recorded relate to the 

 State of Indiana, extending from latitude 37° 50' to about 41° 45' N. 

 The exact latitude of many places of observation is given, not so much 

 for the American reader or investigator as for those of other countries, 

 notably England and Eussia. 



My experiments and observations have been carried on almost exclu- 

 sively out of doors and very largely in the fields, as I consider indoor 

 and breeding- cage observations on this species, except for the purpose 



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