INTRODUCTION. xiii 



The genera Platyptilus, Amblyptilus, and Aciptihts, 

 first characterized by Hiibner (Verz. pp. 429, 430), 

 were originally spelt Platyptilia, Amblyptilia, and 

 Aciptilia. I have followed Wallengren in adopting 

 the termination suggested by Zeller (Isis, 1841, 

 pp. 768-770), and in quoting Hiibner as the 

 authority for the sense in which they are used. 



Dr. Jordan and Mr. Stainton both agree in re- 

 ferring the genus Chrysocorys, Hiibn., to the Ptero- 

 phoridre rather than to the Tineidse, and I have 

 followed those authors in including it here. 



I cannot hope that this contribution to the history 

 of the North-American Pterophoridse will be even 

 nearly as useful as at one time I hoped and in- 

 tended it to be ; for instead of continuing to acquire 

 specimens of this group of insects, and to study them 

 whilst the recollection of those which I had seen in 

 American collections was fresh in my mind, owing 

 to a variety of other occupations withdrawing my 

 attention from the subject, I laid aside in 1873 (about 

 a year after my return to England) all the material, 



