C. V. RILEY, 



Washington, D. O. 



PREFACE. 



It is with a melancholy pleasure that I now place 

 before the public the collected writings on the Tineina 

 of his country of the late Dr. Brackenridge Clemens, 

 of Easton, Pennsylvania. 



Little did I think when I received his first letter in 

 1857, two years before he became an author, that his 

 career was to be so brilliant and so short. 



I had for some years contemplated putting together 

 such an arrangement of his writings as would enable 

 those who were previously unacquainted with them 

 to profit by his remarks on the habits of new genera 

 — genera with which we in Europe were unac- 

 quainted. 



It would perhaps be a hasty conclusion were we to 

 imagine that none of his new genera will ever be 

 detected in Europe. 



Through the kindness of Lord Walsingham I have 

 been favoured with a list of Clemens' Tineina, still 

 extant in the collection of the Entomological Society 

 of Philadelphia, and these I have indicated by an 

 asterisk in the "Attempt at a Classified Arrangement" 

 prefixed to the volume. In a few cases where I have 

 been doubtful whether I had correctly interpreted the 

 meaning of Lord Walsingham's notes I have enclosed 

 the asterisk in brackets, thus (*). 



