TABLE OF CONTENTS 



Introduction ..... 



List of Plates 



List of Text Illustrations 



Order Hymenoptera 



Table of Suborders and Superfamilies 



The True Bees (Superfamily Apoidea) 



Life History of a Bumble Bee (Bombus fervidus) 



Wasps 



The Solitary Wasps (Superfamily Sphecoidea) . 



Life History of a Digger Wasp (Sphecius speciosus 



Say.) .... 



The Social Wasps and Their Allies (Superfamily 



Vespoidea) 



Typical Life History 



Life History of a Parasitic Wasp (Lcelius trogoder- 



matis) 



The Ants (Superfamily Formicoidea) 



Typical Life History 



The Proctotrypoid Parasites (Superfamily Proctotry 



poidea) 



The Gall-Flies (Superfamily Cynipoidea) . 

 The Chalcis Flies (Superfamily Chalcidoidea) . 



Life History of a Chalcis Fly ( Euplectrus comstocki 



How.) 



The Ichneumon Flies (Superfamily Ichneumonoidea) 

 Life History of an Ichneumon Fly (Pimpla inqui 



sitor) 



The Horn-Tails (Superfamily Siricoidea) . 



Life History of a Horn-Tail (Phylloecus integer) 

 The Saw-Flies (Superfamily Tenthredinoidea) . 



Life History of the Pear Slug ( Eriocampoides 

 limacina) . 

 The True Flies (Order Diptera) 



XIX 



xxi 



i 



2 



4 



12 



18 

 18 



22 



33 



34 



31 

 48 



49 

 53 

 56 



57 

 61 



64 

 69 

 7i 



13 



76 

 79 



