xiv CONTENTS 



CHAPTER XXXIII 



PAGE 



THE HYMENOPTERA 338 



General description and structure Terebrantia and Aculeata Develop- 

 ment Distinctive characters Importance Tenthredinoidea Currant 

 Worm Pear Slug Wheat Stem Borers Horn-tails Ichneumonoidea 

 Their importance Methods of work Long-tailed Thalessa Cynipoidea 

 Gall production Alternation of generations Inquilines Parasites Impor- 

 tance of galls Chalcidoidea Habits Wheat Straw Worm Wheat Joint 

 worm Clover-seed Chalcis Fig Blastophaga Pteromalus puparum 

 Serphoidea Long-tailed Pelecinus Variation in habits of parasitic Hymen- 

 optera Chrysidoidea Sphecoidea Vespoidea Progressive development 

 as illustrated by Wasps Apoidea Solitary bees Leaf-cutter bees 

 Carpenter bees Bumble bees Honey bee Life of a Honey bee colony 

 Swarming Value of bee products Formicoidea Composition of ant 

 colonies Location of colonies Swarming Establishment of new colonies 

 Ants and plant lice, etc. Unusual habits Argentine Ant House Ants 

 Ants in lawns. 



