THE GENETICS OF HABROBRACON JUGLANDIS ASHMEAD 



deviation from normal development takes place 

 is yet largely a mystery. In some mutants, 

 there is a suggestion of accompanying differ- 

 ences in behavior. These remain to be studied. 

 Sex determination in Habrobracon has been 

 shown to be complementary, but further experi- 

 ment is necessary before this hypothesis can be 

 shown to hold for the Hymenoptera in general. 

 The effects of environmental changes, X-radia- 

 tion, and neutron treatment are being tested, 

 and these are bringing up new questions. All 

 these problems await investigation, and their 

 solution holds promise of interesting and sig- 

 nificant contributions to the field of genetics. 



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