INTRODUCTION 



tain hymenopteroLis parasites, and by Cushman 

 (1914), and P. W. Whiting (1918, 1921a) in their 

 work with Habrobracon juglandis. This use of 

 Hadrobracon is clearly a misspelling since no 

 such generic name is recognized in scientific 

 literature (Neave, 1939). There have been some 

 genetic studies reported on Microbracon brevi- 

 cornis (Wesraael) (Speicher and Speicher, 1940) 

 and M. pectinophorae (Watanabe) (Inaba, 1939, 

 1940) under the generic name, Habrobracon. The 

 present account, however, deals mainly with the 

 work done on the genetics of Microbracon hebe- 

 tor (Say), but since the name Habrobracon 

 juglandis (Ashmead) has been used as a synonym 

 f-or Microbracon hebetor (Say) and is so well 

 entrenched in genetic literature, it is prefer- 

 able to use it in a work of this kind. 



At present five wild-type stocks of Habro- 

 .Ibracon juglandis are being reared by Whiting 

 for genetic studies. These stocks have been 

 named for the geographic locality in which they 

 were found, and have been arbitrarily numbered 

 «toi differentiate one from the other in genetic 

 'crosses. Thus' wild-type stock number one (1) 

 lis) from Lancaster, Penhsylvania, stock number 

 eleven (11) from Iowa City, Iowa, stocks number 

 'thirty-two (32) and thirty-three (33) from Cal- 

 ifornia, and stock number twenty-five (25) from 

 New York City, New York. 



Habrobracon juglandis is ecto-parasitic on 

 various cereal-infecting caterpillars. Refer- 

 ences in literature to Bracon or Habrobracon 

 brevicornis, Microbracon hebetor, or Habrobra- 

 con juglandis as parasites of the Mediterranean 

 flour moth, Ephestia kuehniella (Zeller) (Wash- 

 burn, 1904), of the meal moth, Plodia inter- 



