234 AN INTRODUCTION TO ENTOMOLOGY. 



The American species of the Phryganeidae have not been monographed. 

 One hundred and fifty species are described in Hiigen's Synopsis of the North 

 American Neuroptera; comparatively little has been written regarding the 

 American forms during the quarter-century that has elapsed since the appear- 

 ance of that work. The student who wishes to make a special study of this 

 group should possess the great work of Robert McLachlan, A Monographic 

 Revision and Synopsis of the Trichoptera of the European Fauna. There is 

 also a paper by Friedrich Brauer which is very useful. This is entitled Ver- 

 zeichniss der bisjetzt bekannten Neuroptera im Sinne Linne's, and is published 

 in the Verhandlungen der Zoologisch-Botanischen Gesellschaft, XVIII. (1868). 

 It contains analytical keys to the sub-families, and to all of the genera described 

 at that time. 



