﻿TABLE 
  OF 
  CONTENTS. 
  

  

  CHAPTER 
  VIII. 
  

  

  Page. 
  

   The 
  Hessian 
  fly 
  — 
  its 
  ravages, 
  habits, 
  and 
  the 
  means 
  of 
  preventing 
  its 
  

   increase 
  198 
  

  

  Introduction, 
  198 
  — 
  losses 
  occasioned 
  by 
  tlae 
  Hessian 
  fly, 
  199 
  — 
  description 
  

   of 
  the 
  fly, 
  207 
  — 
  habits, 
  210 
  — 
  mode 
  of 
  egg-laying, 
  211 
  — 
  effects 
  of 
  the 
  larva, 
  

   213 
  — 
  weather 
  and 
  seasonal 
  influences, 
  215 
  — 
  parasites, 
  216 
  — 
  remedies, 
  220 
  — 
  

   late 
  sowing, 
  221 
  — 
  early 
  sowing, 
  223— 
  advantage 
  of 
  high 
  culture, 
  225 
  — 
  

   pasturing 
  with 
  sheep, 
  225 
  — 
  sowing 
  hardy 
  varieties, 
  227 
  — 
  special 
  remedies, 
  

   229 
  — 
  application 
  of 
  lime, 
  229 
  — 
  rolling 
  the 
  ground, 
  229 
  — 
  close 
  cutting, 
  

   229— 
  burning 
  stubble, 
  230^periodicity 
  of 
  the 
  fly, 
  280 
  — 
  chronological 
  

   table 
  of 
  fly 
  years, 
  232 
  — 
  distribution 
  of 
  the 
  fly, 
  234 
  — 
  its 
  origin 
  in 
  America, 
  

   234 
  — 
  history 
  of 
  its 
  distribution 
  in 
  the 
  Old 
  World, 
  234 
  — 
  in 
  America, 
  240— 
  

   summary 
  of 
  habits 
  and 
  remedies, 
  244 
  — 
  list 
  of 
  works 
  and 
  articles 
  on 
  the 
  

   Hessian 
  fly, 
  245. 
  

  

  PAET 
  III.— 
  SCIENTIFIC 
  EESULTS. 
  

   CHAPTER 
  IX. 
  

  

  Descriptions 
  of 
  larv^ 
  op 
  injurious 
  forest 
  insects 
  251 
  

  

  Buprestidce, 
  251 
  — 
  the 
  flat-headed 
  apple 
  borer, 
  Chrysobofhris 
  femorata, 
  251 
  — 
  

   Chalcopliora 
  virginica, 
  252 
  — 
  Melanophila 
  sp., 
  253 
  — 
  the 
  flat-headed 
  spruce 
  

   borer 
  (Melanophila?), 
  254 
  — 
  the 
  flat-headed 
  peach 
  and 
  cherry 
  borer, 
  Dicerca 
  

   divaricata 
  Say, 
  255 
  — 
  buprestid 
  under 
  hemlock 
  bark, 
  255 
  — 
  Ceramhycidce, 
  

   25() 
  — 
  longicorn 
  larva 
  under 
  hemlock 
  bark, 
  256 
  — 
  Saperda 
  on 
  the 
  willow, 
  

   256 
  — 
  the 
  lesser 
  pine 
  borer, 
  Asemum 
  mosstum 
  Haldeman, 
  256 
  — 
  the 
  oak 
  

   borer, 
  ElapMdion 
  parallelum 
  Newman, 
  257 
  — 
  The 
  common 
  oak 
  Clytus, 
  

   Xylotrechus 
  colonus 
  Fabr., 
  2.57 
  — 
  Clytus 
  (?) 
  larva 
  on 
  black 
  birch, 
  259 
  — 
  the 
  

   ribbed 
  Rhagium, 
  Bh. 
  lineatum 
  Olivier, 
  259 
  — 
  the 
  lesser 
  Prionus, 
  Orthosoma 
  

   hrunneum 
  (De 
  Geer), 
  260 
  — 
  unknown 
  longi<«orn 
  borer 
  from 
  an 
  oak 
  log, 
  

   261 
  — 
  unknown 
  longicorn 
  borer 
  in 
  sycamore, 
  262. 
  

  

  CHAPTER 
  X. 
  

  

  The 
  embryological 
  development 
  of 
  the 
  locust 
  263 
  

  

  Formation 
  of 
  the 
  blastoderm, 
  263 
  — 
  origin 
  of 
  the 
  primitive 
  amoeboid 
  cells, 
  

   264 
  — 
  the 
  blastodermic 
  disc 
  or 
  primitive 
  band, 
  264— 
  the 
  germinal 
  groove, 
  

   264 
  — 
  origin 
  of 
  the 
  cellular 
  or 
  germinal 
  layers, 
  264 
  — 
  diagrammatic 
  view 
  

   of 
  the 
  origin 
  of 
  these 
  layers, 
  from 
  Graber, 
  265 
  — 
  embryonal 
  membranes, 
  

   265 
  — 
  serous 
  membrane, 
  265 
  — 
  amnion, 
  265 
  — 
  tabular 
  view 
  of 
  the 
  eight 
  

   embryonal 
  layers, 
  265 
  — 
  division 
  of 
  the 
  embryo 
  or 
  primitive 
  band 
  into' 
  

   body 
  segments, 
  266 
  — 
  development 
  of 
  the 
  appendages, 
  266 
  — 
  of 
  the 
  nervous 
  

   system, 
  266 
  — 
  of 
  the 
  alimentary 
  canal, 
  266 
  — 
  the 
  stomodeeum, 
  266 
  — 
  the 
  

   proctodsBum, 
  267 
  — 
  the 
  mesenteron 
  or 
  stomach, 
  267 
  — 
  the 
  pyloric 
  append- 
  

   ages 
  of 
  the 
  stomach, 
  267 
  — 
  the 
  Malpighian 
  tubes, 
  267 
  — 
  the 
  genital 
  glands, 
  

   267 
  — 
  the 
  tracheae 
  and 
  salivary 
  glands, 
  267 
  — 
  spinning 
  glands, 
  267 
  — 
  devel- 
  

   opment 
  of 
  the 
  wings, 
  268 
  — 
  criticism 
  of 
  Gegenbaur's 
  views, 
  269 
  — 
  Fritz 
  

   Mtiller's 
  views, 
  269 
  — 
  speculation 
  on 
  the 
  primary 
  origin 
  of 
  wings, 
  270 
  — 
  

   correlation 
  of 
  metamorphosis 
  with 
  the 
  acquisition 
  of 
  wings, 
  and 
  of 
  the 
  

   latter 
  with 
  the 
  ripening 
  of 
  the 
  sexual 
  organs, 
  271 
  — 
  differentiation 
  of 
  

   mesonotum 
  and 
  metanotum 
  dependent 
  on 
  the 
  presence 
  of 
  wings, 
  271 
  — 
  

   development 
  of 
  a 
  pupal 
  stage, 
  271 
  — 
  genealogy 
  of- 
  the 
  orders 
  of 
  in- 
  

   sects, 
  271. 
  

  

  