;knowledgments 



Igment is made to the many individuals who 

 these studies. So many have cooperated over 

 g, rearing, and identifying the various species 

 Tedgment of all contributors is impossible, 

 r credit should be given to the following: the 

 dio organized and encouraged this project; the 

 20 was in charge of the former Bureau of Ento- 

 j-antine laboratory at Melrose Highlands, Mass., 

 3ral direction much of the work was performed; 

 lief of the Division of Forest Insect Research, 



Experiment Station, for his interest and en- 

 reparation of this publication; Charles L. Gris- 

 irest and assistance in the collecting and rearing 



at Melrose Highlands, and especially for prepa- 



specimens for the museum collection; M. T. 

 3d at Melrose Highlands for 1 year and con- 

 ork in New Jersey for 2 years; the late R. T. 

 ue of the earfy rearing work and who was re- 

 ation of most of the Diptera; P. B. Dowden for 

 l of the hymenopterous parasitic material; and 

 mination of some of the dipterous parasites, 

 ment is made to C. F. W. Muesebeck, former 



Division of Insect Identification, Agricultural 

 i to members of his staff for determination or 

 pecies reared. The staff described and named 

 parasitic Hymenoptera reared in the course of 



ill 



i 



drawings maj !><• obtained throi 



rom the Extension auriculiural »r 

 ricultural colleges. There is u-.u, 



151, I \\ O-PEN Bl II BAR] 



.1) l.oi S 



• hiv plan arc no) %\ ail.ihlr in \, 



')«pannicni df Agriculture, U 

 .arch Division, Plan! Indus 

 l he i . S. Depart menl »f \u 



•• draw Ings, bin will direct j 



huir them. 



I.ssiipH IspntomKor 1 



