YIII PEEFACE. 



the plates that the figured specimens proved to deserve better another, mostly new name which could yet be 

 done in the text, whilst the plates had already been published. We therefore beg to accept this drawback as 

 the consequence of the continuous progress of our knowledge. 



Thus the fifth volume, like its predecessors, is sent forth with the sole task of serving as a text-book 

 to all the representatives and friends ot lepidopterology. Just as little as the author intended wath the volumes 

 of the first part, he strived to create a sumptuous w'ork with as many siu-prises as possible, with improved systems 

 and unexpected novelties. A systematically and uniformly arranged elaboration of the American day-butterflies, 

 organized into a complete set, with a short description of the habits and stages of development, but with as 

 much consideration of the variations, faimae and synonymy as possible, that is the main task of the work, 

 and if it should be recognized from its contents with how great a devotedness the authors as well as the editor 

 and publisher have bestowed their fullest attention to this design, this acknowledgment will be their best reward. 



Darmstadt, May 1924. 



Dr. Adalbert Seitz. 



