INSECTS 



83 



Fig, 139. — May Fly. What order (see table)? 



Exercise in the Use of the Table or Key. — 



Write the name of the order after each of the fol- 



lowing names of insects : — 



Wasp (Fig. 122) 



Weevil (Fig. 163) 



Squash bug ( Fig. 184) 



Ant lion (Fig. 170) 



Dragon fly (Fig. 177) 



Ichneumon fly (Fig. 159) Botfly (Fig. 138) 



House fly (Fig. 172) 

 Flea (Fig. 173) 

 Silver scale or earwig 



(Fig. 140) 

 Codling moth (Fig. 141) 



Fig. 140. — Silver 

 Scale. (Order?) 



Moths and Butterflies. — Order- ? Why (p. 82) ? 



The presence of scales on the wings is a never-failing 

 test of a moth or a butterfly. The wings do not fold at all. 

 They are so large and the legs so weak and delicate 

 that the butterfly keeps its balance with difficulty when 

 walking in the wind. 



The maxillae are developed to form the long sucking 

 proboscis. How do they fit together to form a tube ? 

 (See Fig. 147.) The proboscis varies from a fraction of an 

 inch in the "miller" to five inches in some tropical moths, 

 which use it to extract nectar from long tubular flowers. 

 When not in use, it is held coiled like a watch spring under 

 the head (Fig. 148). The upper lip (labrum), under lip 

 (labium), and lip fingers (labial palpi) are very small, and 

 the mandibles small or wanting (Fig. 146). 



The metamorphosis is complete, the contrast between 

 the caterpillar or larva of the moth and the butterfly and 

 the adult form being very great. The caterpillar has the 

 three pairs of jointed legs typical of insects; these are 



