PREFACE. V 



any one of them, are referred to my " Butterflies of the 

 Eastern United States and Canada/' and to Edwards's 

 " Butterflies of North America," in one or the other of 

 which ample accounts will often be found. 



Species which are found in the region embraced in this 

 work, but not regarded as sufficiently common therein to 

 merit a place in it, are mentioned by name in their 

 appropriate places in smaller type; they number just 

 about as many as those of which descriptions are given, 

 and full accounts of most of them will also be found in 

 the works above mentioned. 



A short Introduction to the study of Butterflies in gen- 

 eral, with special application to our own, is prefixed to the 

 body of the w^ork, and is followed by a brief section show- 

 ing where the principal literature upon the subject is to be 

 found. An explanation of some of the terms used is 

 appended, and a figure added on p. 60 explanatory of the 

 nomenclature of the wing. 



Cambridge, April 13, 1893. 



