CLASS HEXAPODA. 



71 



PIG. 118. 



Co' re us tfts' tis. 

 Squash-bug. 



young in a summer. One species [Eriosoma lanigera] 

 (e ri os'6 ma lan ij'e ra), covered, with a woolly, flocculent 

 (flok'ku lent) substance, causes, by sting- 

 ing the bark, the apple-blight when the 

 leaves turn yellow and drop off. The 

 small Phylloxera (m lox e'ra), or Root- 

 louse, so destructive to grape-vines, is 

 also one of the Aphides. Closely allied 

 is the Cochineal-bug (kotch'i nei) of Mex- 

 ico, the females of which, when ground 

 up, give the rich dye of commerce. 



The Squash-bug, like many members 

 of the order, has a most disagreeable 

 odor. The Louse and Bed-bug are, perhaps, too well 

 known to need either figure or explanation. 



ORDER COLEOPTERA (ko le op'te ra). 



The Coleoptera, or Beetles, have the anterior wings 

 of a horny texture, meeting, when closed, in a straight 

 line along the back. The posterior membranous wings 



are the sole organ of flight. The mouth- 

 parts are strong and formed for chewing. 

 The metamorphosis is complete. The 

 larva is the animal commonly called a 

 " Grub." This has a well-developed head, 

 three thoracic feet, and the abdomen long 

 and often fleshy. About 100,000 species 

 have been described. 



The Colorado Beetle, or Potato-" bug" 

 which, within a few years, has spread 

 itself eastward over the entire country, 

 is the most familiar member of this 

 order. The rapid transformations, from egg to adult, oc- 



FTG. 119. 



Dorftph'dra decemline- 

 a' ta. Colorado Beetle. 

 Eggs, Larva, Adult 



