INTRODUCTION 



The present index, prepared by Miss Mary J. Snyder, Secretary 



to the Illinois State Laboratory of Natural History, is in continuation 

 of an index to the first twelve reports of the Illinois State Entomolo- 

 gist made in 1S85 and printed as an appendix to the Fourteenth Report 

 of this series. The systematic list of genera and species has been re- 

 vised by Mr. C A. Hart, who is responsible for the synonymy indi- 

 cated. 



The twelve reports now indexed have all been issued by the pres- 

 ent writer, the first of these being the second of his personal series. 

 The thirteenth to the twentieth reports inclusive were published, like 

 the preceding six. as appendices to the Transactions of the State De- 

 partment oi Agriculture, a small edition of separates — usually two 

 hundred or three hundred copies — being furnished to the Entomologist 

 for his personal use. With the Twenty-first Report, however, a change 

 in the method of publication was made, the various articles of the 

 report being published first as bulletins of the State Agricultural Ex- 

 periment Station, one thousand copies of which were printed in form 

 for binding, from time to time, as a report of the State Entomologist. 

 With these were usually included some additional articles which had 

 not been separately issued, but which appeared in the state report only. 



ldie Thirteenth Report, printed in 1884 with the twenty-first vol- 

 ume oi the Transactions of the State Department of Agriculture, was 

 devoted mainly to the discussion of insects injurious to the strawberry. 

 but contains, among other miscellaneous articles, one on insects affect- 

 ing sorghum and broom-corn, and two articles on insects injurious to 

 the wheat plant. 



ddie Fourteenth Report I Agricultural Transactions, Vol. XXII., 

 1SS5 I is of a miscellaneous character, containing articles on both agri- 

 cultural and horticultural insects, among the former a first contribu- 

 tion to a knowledge of the life history and parasites of the Hessian 

 fly, and a contribution to the life history of the corn root-aphis. It 

 also contains an index to the first twelve reports oi the office series. 



The Fifteenth of the series (Vol. XXI Y. of the Transactions, 

 1889) consists mainly of a report of experiments with arsenical poi- 

 sons for the destruction of the codling-moth and plum-curculio in 

 apple orchards, a second contribution on the Hessian fly, the life history 



