HOW TO KNOW THE IMMATURE INSECTS 



when the author was a student in his classes has made the book 

 possible. Dr. H. E. Jaques, Professor of Biology, Iowa Wesleyan College, 

 has given encouragement and invaluable suggestions. My wife, Y. S. 

 Liu has helped with drawings and in many other ways. The author 

 wishes to thank them most sincerely for all their kind help. 



Peiping, China 

 January 1, 1949 



4^ -^^ /^ 



":> 



We have found Dr. Chu not only a thoroughly trained Entomologist 

 and an excellent teacher but also a most faithful friend. He has given 

 much time and thought to the preparation of this manual in a com- 

 parative new and difficult field. We feel certain that students of in- 

 sects will find it highly helpful. 



