126 



AN 7 IMAL FORMS 



adhere to our fingers when handled. This feature, and 

 the general plan of the body, which is much the 



FIG. 78. The silver-spot (Argyituis cybele). Photograph by A. L. MELANDEK and 

 C. T. BRI-ES. 



throughout the group, enables us to recognize most of 

 them at once. 



123. Development and metamorphosis. In some of the 

 simplest insects, as in the bugs, the young at birth resemble 

 their parents. In other insects the resemblance is not so 

 close. The young grasshopper, for example, hatches, from 

 an egg laid in the ground, with a ridiculously large head 

 and staring eyes ; still there is no difficulty in recognizing 

 its relationships. During the next week internal changes 

 take place. The shell is burst, and the grasshopper emerges, 

 looking more like its parents than before. This process is 

 repeated four or five times during the next few weeks, and 

 the gradual changes thus produced finally bring the young 

 insect to the adult form. This latter state has been attained 

 by an incomplete metamorphosis. 



