CONTENTS 



Page 



Introduction 4 



Order Hymenoptera 6 



Suborder Symphyta, by B. D. Burks 6 



Superfamily Megalodontoidea 6 



Superfamily Tenthredinoidea 14 



Superfamily Siricoidea 26 



Superfamily Cephoidea 27 



Suborder Apocrita 27 



Superfamily Ichneumonoidea 27 



Family Braconidae, by C. F. W. Muesebeck 27 



Family Ichneumonidae, by L. M. Walkley 60 



Superfamily Chalcidoidea, by B. D. Burks 213 



Superfamily Cynipoidea, by L. H. Weld 282 



Superfamily Evanioidea, by L. M. Walkley 284 



Superfamily Pelecinoidea, by C. F. W. Muesebeck 285 



Superfamily Proctotrupoidea, by C. F. W. Muesebeck and 



L. Masner 285 



Superfamily Bethyloidea, by Karl V. Krombein 305 



Family Trigonalidae, by L. M. Walkley 322 



Superfamily Scolioidea, by Karl V. Krombein 322 



Family Formicidae, by M, R. Smith 343 



Superfamily Vespoidea, by Karl V. Krombein 374 



Family Pompilidae, by Karl V. Krombein 378 



Superfamily Sphecoidea, by Karl V. Krombein 386 



Superfamily Apoidea, by Karl V. Krombein 422 



Index to new names proposed in the Supplement 521 



Index 521 



