INTRODUCTION. 



(FROM THE FIRST EDITION.) 



To know how to do a thing is a great step towards its 

 accomplishment ; but to know exactly when to do it, is often 

 the one thing needful to insure success. The regularity with 

 which, at certain definite dates, most species of Butterflies and 

 Moths ordinarily appear, is something almost marvellous ; and 

 many species are not obtained in fine condition through inatten- 

 tion to the time of their advent, while some may be missed 

 altogether. Although every care has been taken in giving the 

 dates of appearance, it is evident that some allowance must be 

 made for the difference of locality, for our variable climate, and 

 for other causes, which militate against an unerring accuracy 

 being always attainable. The time given for the Images includes 

 the earliest at which they appear, in ordinary seasons, so that 

 the Collector may be able to secure them in the best condition. 

 It is hoped that the notes under most of the months will be 

 found to contain some useful hints ; and that the CALENDAR, 

 altogether, will prove a useful TIME-GUIDE to the Lepidopterist 

 throughout the year. 



M368485 



