CONTENTS 



PAGE 



Preface v 



List of Illustrations ix 



DiPTERA. By D. W. Coquillett i 



Tenthredinoidea. By Trevor Kincaid 79 



Sphegoidea AND Vespoidea. By Trevor Kincaid 107 



FoRMiciD^. By Theo. Pergande 113 



Hymenoptera. By William H. Ashmead 119 



Index 275 



(vn) 



