PREFACE. 



SEVERAL additions have been lately made to the J41 families 

 into which the Lepidoptera Heterocera were formerly divided, and 

 there are indications of a vast increase in the number of genera 

 which compose them, and synonyms of some already published 

 frequently appear. 



A slight revise of the groups above mentioned may be useful, 

 and will, perhaps, be prepared at an early period. 



The following descriptions were written to fulfil an agreement 

 that the species thereby characterized should appear in print. 



F. WALKER. 



October, 1869. 



