EASTERN UNITED STATES. 49 



for the old ones as the leaves are consumed, and the 

 larvae will go on to pupation. This is when it is 

 desired to get chrysalides by wholesale. 



"But where observation of the larvae is necessary, 

 glass tubes and tumblers, and gauze-covered flower-pots, 

 and tin pails and nail-kegs, will answer all the purposes 

 of elaborate and expensive cages, and be more satisfactory, 

 I apprehend. At any rate, all my work is done in this 

 way." A reference to Mr. Edwards's publications will 

 attest the success of his methods of rearing butterfly 

 larvae. 



USE OF THE KEY. 



In the preparation of the following key for the aid of 

 the student in identifying specimens, an effort has been 

 made so to combine a key to the genera with one to the 

 species that they shall be one key, and at the same time 

 have the merits of separate keys. This has been done 

 by inserting, at the end of a description referring to a 

 genus, the generic name as well as the number referring 

 to where the specific descriptions begin. If the genus 

 to which a given specimen belongs is known, it will not 

 be necessary to begin at the first of the key and go 

 through till the particular genus is reached, but by 

 running the eye over the names at the right-hand side 

 of the page the genus may be found, and the number 

 after the generic name will direct where to go to find 

 the species. 



In the preparation of the key such characters have 

 been used as would be the most readily recognized by 

 the student, facility in identification being aimed at, 

 though by so doing the tables were made in a measure 

 artificial. The numbers in parentheses after the species 



