FOREWORD 



This summary is designed for students of 

 Habrobraconology. Although written primarily 

 for use in course work, it is hoped that it may 

 serve as a reference for those engaged in ex- 

 perimental genetics. The aim of the work has 

 been to present a clear and readable account of 

 the results of investigations made thus far in 

 the genetics of Habrobracon juglandis (Ashmead). 



The insect is described, and its method of 

 culture as well as that of its host is outlined 

 in detail. A complete list of extant and dis- 

 carded mutant types is included. The statisti- 

 cal formulas utilized in determining crossover 

 values and other linkage problems are pre- 

 sented. Tables in the appendix summarize pres- 

 ent linkage information and effects of X-radia- 

 tion. A glossary and a complete bibliography 

 of Habrobraconology accompany the summary. 



I am deeply indebted to Professor P. W. 

 Whiting, of the University of Pennsylvania, for 

 reading the manuscript and for making valuable 

 suggestions, and to Dr. G. M. McKinley, of the 

 University of Pittsburgh, for his encourage- 

 ment. Special thanks are given to my wife, Dr. 

 Phyllis C. Martin, of the Pennsylvania College 



VII 



