CHAPTER V. 

 Clms IV.— Ptilota, or Winged Insects. 



Characters . . . .163 



section I. 

 On the principles which regulate 



the metamorphoses of insects 164 

 Views of Swammerdam, Herold, 



and Kirby . . . .165 

 Ditto of Virey . . . .166 



SECTION II. 



J peculiarities exhibited by in- 

 sects in their passage to the 

 perfect state . . . 169 

 arious stages of developement 170 

 >tb-section 1. — The Egg . . 171 

 Eggs deposited in nests . 172 



Number and form of eggs . 174 

 Instinct of female in providing 

 for and protecting her young 177 



\b-section 2. — The Larva . 179 

 Uniformity of structure . 180 

 Monomorphous larvae . . 181 

 Heteromorphous larvse . . 182 

 Head of larva, & its appendages 183 

 Other segments of larvse . 185 

 Analogies of larvae . . 188 



Voracity of larvae . . .189 

 Colours and growth of larvse . 192 



^ub-secfion 3.— The Pupa . 194 

 Varieties of the pupa . . 195 

 atreille's arrangement from 

 letamorphoses . . .201 



Newman's ditto 

 Observations thereon . 

 Metamorphosis inchoata 

 Metamorphosis dimidiata 

 Metamorphosis perfecta 

 Chrysalides .... 

 Segments of pupae . 

 Arrangement of limbs in pupae 

 Duration of pupa state . 



Cocoons 



Cocoon of silk-worm, &c. 

 Escape of imago from pupa . 

 Anomalous deviations . 



: ECTION III. 



The general structure of insects, 



as especially exhibited in their 



perfect state 

 Siib-secfion 1.— External Ana- 

 tomy 



Segments of the body . 

 A, The Head .... 



Clypeus 



Head organs .... 



Composite eyes 



Ocelli 



Antennae .... 



Mouth 



Varieties of mouth 



Labrum 



Mandibles . . 



Maxilhe 



203 

 204 

 205 

 206 

 208 

 211 

 212 

 215 

 217 

 219 

 222 

 224 



223 



225 

 227 

 229 

 232 

 232 

 234 

 237 

 238 

 243 

 245 

 249 

 250 

 252 



