10 rNTRODUCTION. 



Lepidoptera, six of Homoptera, five of Heteroptera, and eight of 

 Diptera. Mr. Glover contemplates adding six or eight more plates 

 of Coleoptera, and ten or twelve of Lepidoptera, to make the work 

 as complete as possible. These will make, at least, two hundred 

 and twenty-two plates, and as each plate contains twenty-five or 

 more figures, we shall have here exhibited, at the lowest estimate, 

 six thousand, five hundred and fifty illustrations of our North 

 American insects. In addition to these, there are already com- 

 pleted, twenty-two plates of the cotton plant and the insects in- 

 jurious to it. The drawing and etching have both been performed 

 by Mr. Glover himself, and the whole work, as I understand, has 

 been performed wholly outside of his regular office hours ; a re- 

 markable monument, certainly, to the zeal and industry of the 

 author. This work, having been performed under such disadvan- 

 tageous circumstances, the figures necessarily exhibit considerable 

 inequality, in point of excellence, and many of them will have to 

 be retouched before they are ultimately submitted for publication ; 

 but the author informs me that the whole work could be finished 

 in a few months if he could devote his time exclusively to it. 



The clause in the law by which the office of State Entomologist 

 was established, which makes it a part of his duty to prepare a 

 cabinet of the insects of the State for the Illinois Industrial Uni- 

 versity, has never yet been carried out. Mr. Walsh had accumu- 

 lated valuable materials for this purpose, but no suitable provision 

 has yet been made at the University to receive them. It is my 

 intention, as soon as the work of preparing this Report is com- 

 pleted, to commence making up a collection, systematically ar- 

 ranged and named, both from Mr. "Walsh's collection and my own, 

 to be placed in temporary boxes, ready to be transferred to the 

 museum of the Industrial University, whenever it shall be desired, 

 and when suitable provision shall be made for their reception. 



Most of the figures accompanying this report are reprints of 

 figures prepared by Mr. C. V. Riley, for the illustration of his 

 own Reports, or the pages of the American Entomologist. So far 

 as I could avail myself of these figures, it answered my purpose 

 as well as new engravings could have done, and they were ob- 

 tained at considerably less than the original cost. 



