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 AUTHORSHIP 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. 1 ACKNOWLEDGMENT 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) wasps) wasps) A. Menke (Sphecidae) doidea, and Apidae) dae) sep. 2 CONTENTS Page Suborder Symphyta, by B. D. Burks Family Braconidae, by C. F. W. Muesebeck Family Ichneumonidae, by L. M. Walkley Superfamily Chalcidoidea, by B. D. Burks Superfamily Cynipoidea, by L. H. Weld Superfamily Evanioidea, by L. M. Walkley Superfamily Pelecinoidea, by C. F. W. Muesebeck Superfamily Proctotrupoidea, by C. F. W. Muesebeck and Superfamily Bethyloidea, by Karl V. Krombein Family Trigonalidae, by L. M. Walkley ... Superfamily Scolioidea, by Karl V. Krombein Family Formicidae, by M. R. Smith Superfamily Vespoidea, by Karl V. Krombein Family Pompilidae, by Karl V. Krombein .... Superfamily Sphecoidea, by Karl V. Krombein Superfamily Apoidea, by Karl V. Krombein |