48 



ZOOLO(iY 



live in the interior of leaves and form winding or lilotch-like 

 " mines " in them. The larv;e of some species make a case 

 out of pieces of leaves united by silk and carry this about 

 with them. They are known as "case-bearers" (Fig. 51). 

 To this family belong the clothes-moth, of which we have three 



Fig. .51. — Case-bearing insect.s on a twig. Photo, from life by ^'. H. L. 



species. They fly in the middle of spring and lay their eggs on 

 woollen cloth, furs, or feathers, upon all of which the larvse 

 feed. 



Another order of insects very different in appearance from 

 the Ijcpidoptera but still related to them is the order Hymen- 

 optera,^ which includes bees, wasps, ants, and certain less well- 

 known insects. They all ha^'e four similar membranous wings 

 as the Lepidoptera do ; l)ut, unlike the Lepidoptera, their 

 wings are not covered with scales, but are transparent. The 

 mouth parts are formed for biting or for sucking, l>ut the 

 proboscis is not so long that it rolls up as in Lejiidoptera. 



The Hymenoptera belong to one or the either of two groups — 

 the stinging Hymenoptera, in which the female is provided 

 with a sting ; and the boring Hymenoptera, which are provided 



^ Hymen, membrane : pteron, wing. 



