238 



ZOOLOGY 



at least twenty-five thousand cocoons to form the material for 

 a single dress. 



Harm done by Moth Larvag. — From the economic standpoint 

 the harm done by the moths far outweighs the good they may 



have done. Although they pol- 

 linate flowers to some extent, 

 still the butterflies are greater 

 bearers of pollen. Great dam- 

 age is done annually by the 

 larvae of moths. Massachusetts 

 has spent some $3,000,000 in 

 trying to exterminate the im- 

 ported gypsy moth. The cod- 

 ling moth, which bores into 

 apples and pears, is estimated 

 to ruin yearly $3,000,000 worth 

 of fruit in New York. Among 

 these pests, the most important 

 to the dweller in a large city is 

 the tussock moth which de- 

 stroys our shade trees. The caterpillar may easily be recognized 



Female tussock moth which has just emerged 

 from the cocoon at the left upon which it 

 has deposited over two hundred eggs. 

 From photograph, slightly enlarged, by 

 Davison. 



Larva of tussock moth. From photograph, twice natural size, by Davisono 



