208 



AGRICULTURE OF MAINE. 



mens of this common pest sent in that I have thought best to 

 illustrate the life history and give a short description of the 



OYSTERSH^LL BARK LOUSE. , 



Fig. 16. Lepidosaphes ulmi: a, b, females; c, scales on twig' 

 d, male scale. ;Howara. Bulletin 3L Div. of Entomology, U 

 S. Dept. of Agri.) 



same. The cuts are self explanator)-. It is easily recognized by 

 being oyster shaped, thus the name, although the male scale is 

 much smaller and does not have the peculiar curved shape like 

 the female. During the fall and winter the eggs may be found 

 safely hidden under the scale. In the early summer these hatch 

 into minute freely crawling young lice. They wander about over 

 the tree and in a short time locate on the twigs and branches, 

 becoming fixed ; a new scale forming over them. The males 

 alone have wings. The females lay their eggs in September, 

 dying soon after. There is but one brood each year in Maine. 



