PREFACE. 



FOB a number of years the writer of these pages has 

 recognized the necessity of some form of manual to be 

 placed in the hands of students in zoology, to enable 

 them to identify the animals that should come before 

 them for examination. Jordan's "Manual of Verte- 

 brates" supplies this demand as to the vertebrate ani- 

 mals, but there are many other specimens of interest 

 within the reach of every student that do not belong 

 to this great branch of the animal kingdom, among 

 the most attractive of which a. \ butterflies. Several 

 years ago, analytical tables of the butterflies of Illi- 

 nois were prepared and published for the use of our 

 classes in zoology. These tables, followed by others 

 on the moths, notwithstanding many imperfections, 

 served so good a purpose in the class-room, and were 

 sought by so many private students, that the prepara- 

 tion of a more extended work on the Butterflies of the 

 Eastern United States has been undertaken. The work 

 embraces a brief description of the several stages of 

 butterflies, methods of capture and preservation, an ana- 

 lytical key, and a more complete description of all the 

 species that have been found in this region. In the 

 last part the preparatory stages are given so far as they 



