4 INTRODUCTION. 



2. ORDER. ORTHOPTERA. (Locusts, Grasshoppers, ffc.) 



b. Four sometimes equal, sometimes unequal membraneous 

 wings with reticulated nervures, but never folded. 



3. ORDER. DICTYOPTERA. (Cockroaches.} 



B. Those with a perfect metamorphosis. The larva is a long maggot, 

 caterpillar, or wornil. The pupa generally quiescent, and does not eat. 



a. Some have a suctorial mouth. 



a. Insects with two naked transparent wings. 



4. ORDER. DIPTERA. (Ffe.) 



b. Insects with four large wings, covered wholly, or partially, 



with broad scales. 



5. ORDER. LEPIDOPTERA (Butterflies, Moths.) 



b. The others have a masticatory mouth, or at least visible man- 



dibles and palpi. 



a. Four equal wings, with reticulated nervures. 



6. ORDER NEUROPTERA. (Dragon Flies, $c.) 



b. Four unequal wings, with the nervures variously branching. 



7. ORDER. HYMENOPTERA. (Sees, Wasps, Ichneumons, $c.) 



c. Four unequal wings, the superior ones consisting of a corneous 



case. 



8. ORDER. COLEOP-TERA. (Beetles.) 



Note. Throughout almost all the orders there are apterous families, 

 genera, and species, which are very easily referred to their orders from 

 their metamorphosis, and the structure of their mouths, but they never 

 form correctly a distinct one, as Latreille insists, and which he calls 



APTEKA. 



