NATURE-STUDY 



and l^ark-boring beetles arc injurious to trees. Carpet-beetles 



destroy our carjjets. 





Fig. 63. A Beetle. 



Tiger-beetles are active and feed upon 

 other insects, and so does the Httle 

 polka dotted ladybug. The large, 

 black water-beetle also feeds on other 

 insects. The goldsmith's-beetle is a 

 handsome cousin of the June-beetle. 

 The fire-fly is also a beetle. 



Flies, Mosquitoes, and Crane-flies 

 form another order, the Diptera (Two- 

 winged). The name refers to the 

 fact that these insects have only one 

 pair of fully developed wings, the 



This insect lays its eggs on 



hind pair having become rudimentary 



The House-fly is typical 

 decaying manure or ex- 

 posed meat, etc. \'ery 

 soon small, white, footless 

 larvte hatch out, which 

 are called maggots, and 

 feed upon the substance 

 in which they are hatched. 

 After about a week the 

 maggots shrink into bar- 

 rel-shaped pupcE ( corre- 

 sponding to the butterfly 

 chrysalis), from which 

 after another week the 

 adult winged flies emerge. 



The fly has a rather large head, connected by a very flexible 

 neck to the hairy thorax. This is well marked off from the 



Fig. 64. 



Head and Mouth-parts of a 

 Predacious Beetle. 



(Photomicrograph.) 



