208 ELEMENTARY ZOOLOGY 



The Coleoptera is the largest insect order, probably 

 100,000 species of beetles being known, of which 10,000 



FIG. 71. A trio of apple tent-caterpillars, Ctisiocampa americana, natural 

 size. These caterpillars make the large unsightly webs or ;i tents " in 

 apple-trees, a colony of the caterpillars living in each tent. (Photograph 

 from life by M. V. Slingerland.) 



species are found in North America. They pass through 

 a complete metamorphosis (figs. 75 and 76), the larvse of 

 the various kinds showing much variety in form and habit. 



