CONTENTS XI 



Page 

 CHAPTER XVIII 



Hymenoptera 311 



The Barberry Sawfly (Hylotoma berberidis) — A Hessian-fly Parasite {Platy- 

 gaster hiemalis) — The Cabbage-looper Parasite {Litomastix floridana) — The 

 Honeybee {Aphis mellifica). 



CHAPTER XIX 



Trichoptera and Lepidoptera 333 



Trichoptera, the Caddis Fly {Neophylax concinnus) — Lepidoptera, the 

 Yellow Bear {Diacrisia virginica). 



CHAPTER XX 



Siphonaptera and Diptera 356 



Siphonaptera, the Fleas — Diptera, the Mourning Gnat (Sciara coprophila), 

 Blowflies (Calliphora erythrocephala and vomitoria) . 



CHAPTER XXI 



Myriapoda 382 



Chilopoda, the Centipedes (Scolopendra cingulata and dalmatica) — Diplopoda, 

 the Millepedes {Platyrhacus amauros, Julus terrestris, Polydesmus abchasius) 

 — Symphyla (Hanseniella sp.). 



Bibliography 417 



Index 455 



