102 



ARTHROPOD A 



which may be secured free from the United States 

 Department of Agriculture, will keep the pest in check. 



FlG. 111. Asiatic lady- 

 bird imported to de- 

 vour the San Jose 

 scale, c, larva ; /, 

 adult. Enlarged four 

 times. After Marlatt. 



FIG. 112. Oyster-shell scales, three of which 

 have holes showing where Chalcis flies es- 

 caped after destroying the contents. Three 

 times natural size. 



The oyster-shell bark louse (Mytilaspis pomorum) is not 

 so serious a pest as the pernicious scale. It brings forth 

 only one brood annually, and remains over winter in the 

 egg state. 



