3 02 



ZOOLOGY 



Order Lepidoptera (scale-wings}. These are Hexapoda which pass through a 

 complete metamorphosis, in the adult possess sucking mouth parts, and have two 

 pairs of large membranous wings covered with scales. The moths and butterflies 

 are the representatives of the order. The larvae are known as caterpillars, which, 

 with a few exceptions, are vegetable feeders. The adult butterfly differs from the 



PIG. 



143. Two stages in the metamorphosis of the Mosquito. From Packard A, larva; B, 

 pupa; C, ventral view of the oar-like appendages of the last segment of the pupa. 



FIG. 144. 



PIG. 144. 



The Hessian Fly (Cecidiomya destructor). From Standard Natural History, 

 adult; b, larva; c, pupa; d, larvae in position on stalk of wheat. 



a, the 



Questions on the figures. Give names to all the structures apparent on the 

 adult. In which stage does the insect do its damage? What is its economic 

 importance? What is the origin of its common name? 



moths (typically) in the fact that the former fly by day, hold the wings erect when 

 at rest and have antennae with a club on the end. The butterflies share with the 

 birds the preeminence in beauty among animals. They present many points of 

 interest in their metamorphosis, in their habits, their coloration their distribution, 

 and their economic effects. 



