16 ELEMENTARY LESSONS ON INSECTS 



tion of the synthorax with the abdomen, under the pro- 

 tection and covering of hardened fore wings. Note that 

 these meet in a straight line down the middle of the back. 

 Lift a fore wing and find the hind wing underneath, and note 

 that it is folded both crosswise and lengthwise. (To be con- 

 tinued later, page 94.) 



6. Examine an adult wasp, noting expecially (1) the 

 elbowed antennae; (2) the small hind wings, hitched on to 

 the rear margin of the fore wings by a row of minute hook- 

 lets, so that the two pairs function as a single unit; (3) 

 the consolidation of the basal segment of the abdomen 

 with the metathorax, and (4) the sting at the tip of the 

 abdomen. (To be continued later, page 124.) 



7. Examine prepared slides showing special forms of 

 antennae and feet in a number of common insects. 



This brief survey of external parts will show the plan 

 on which an insect skeleton is built, with certain modifica- 

 tions in its details, and will give some idea of what may be 

 expected in other insects. 



