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Prepared by the staff and collaborators of the Hymenoptera Unit,
under the direction of
For sale by the Superintendent of Documents, U. S. Government Printing Office
Washington, D.C. 20402 Price $2.75
This publication was prepared by the staff and collaborators of the Hymenoptera Unit whose individual responsibilities were as follows: Introductory section and general editorial supervision by Karl V. Krombein * and B. D. Burks; Symphyta and Chalcidoidea by B. D. Burks ; Braconidae and Pelecinoidea by C. F. W. Muesebeck; Ichneumonidae, Evanioidea, and Trigonalidae by L. M. Walkley; Cynipoidea by the late L. H. Weld; Proctotrupoidea by C. F. W. Muesebeck and L. Masner; Formicidae by M. R. Smith; and Aculeata by Karl V. Krombein.
* Now Chairman, Department of Entomology, Smithsonian Institution.
We are indebted to a number of our colleagues for furnishing information which has been included in this supplement. Their names and the groups in which they furnished information are as follows:
H. W. Allen (Ichneumonidae)
A. Menke (Sphecidae)
doidea, and Apidae)