INTRODUCTION. 



This is the second of a series of publications, issued by authority of the 

 State Board of Education of Illinois, and designed especially to elucidate 

 the natural history of this State. The first number was published in De- 

 cember, 1876, as Bulletin No. 1 of the Illinois Museum of Natural History ; 

 but a change in the title of the institution issuing them, necessitates a 

 change in the title of the series. 



S. A FORBES, 

 Director HI. State Lab. of Nat. Hist. 

 Normal, 111., Dec. 12, 1877. 



