Introduction ?,1 



studies, were of prime assistance. The criticisms of Dr. Joseph Bequaert 

 and Mr. Charles Schaeffer, while my remarks were under discussion at 

 meetings of the New York Entomological Society, also saved me from 

 some errors. Finally, Dr. Frank E. Lutz has been good enough to read 

 the Mss. from the standpoint of general biology and evolution, and Dr. 

 Adam Boving has, with great generosity, told me of some results of his 

 deep studies of the larvae of Coleoptera, in advance of his own pubhcation 

 thereof, thereby enabling me to indicate some, at least, of the points of 

 difference. 



