CONTENTS. XI 



CHAPTER XV. THE NATURAL HISTORY OF VA- 

 RIOUS OBNOXIOUS SPECIES OF DIPTEROUS 

 INSECTS. 



Distribution of Species and Individuals Housefly Struc- 

 ture of its Mouth Power of Walking against Gravity 

 Ovoviviparous Flies The Blowfly and Blue Bottle- 

 fly Wheatfly Hessianfly German Wheatfly Choral 

 Dances of Summer and Winter Midges Midnight Gyra- 

 tions of Midges Gnat, 213 



CHAPTER XVI. THE NATURAL HISTORY OF VA- 

 RIOUS OBNOXIOUS SPECIES OF DIPTEROUS 

 INSECTS CONTINUED. 



Moscheto The Black Fly of America Domestic Fly 

 The Hungarian Fly Gadflies Breeseflies Structure 

 of Mouth of Tabanus and Gnat Females only Blood- 

 thirstyThe Zimb The Forest-fly, 233 



CHAPTER XVII. THE NATURAL HISTORY OF VA- 

 RIOUS SPECIES OF SAWFLIES. 



An Account of the Ovipositor and Sawing Apparatus An 

 Account of the Rose Sawfly Description of their Eggs, 

 Larvae, the Effect of Rain Description of their Cocoon 

 their Perfect State its Ravages on Turnips, . . . 246 



CHAPTER XVIII. NATURAL HISTORY OF PARA- 

 SITICAL INSECTS FOUND ON PLANTS, AND 

 PARASITICAL PLANTS FOUND ON INSECTS. 



History of the Gall found on the Brambles Its Parasite 

 History of the Cimex which attacks Flowers History of 

 a Beetle which attacks Leaves History of the Cater- 

 pillar peculiar for forming Galls History of the Insect 

 which forms resinous Galls on the Pine-tree An Ac- 

 count of the Fungus found attached to the Melolontha 

 or Maybug An Account of the Vegetating Wasp: An 

 Account of the Plant found on the Pupa of a Cicada, on 

 Moths, and on Larvae The supposed Causes of the Phe- 

 nomena An Account of Portions of Flowers being found 

 attached to Insects, 254 



CHAPTER XIX. NATURAL HISTORY OF SOME 

 INSECTS WHICH ARE OBNOXIOUS TO TREES. 



History of the Larva which is termed the Oak pruner 

 History of the Larva which causes Tumours on Fruit- 

 trees History of Hylesinus Destructor History of the 

 Brown-tailed Moth, 266 



