No. 4.] 



THE SAX JOSE SCALE. 



391 



hair-like beak or proboscis, used for feeding, is shown curled 

 up between its legs. 



The mature female, represented greatly enlarged in Fig. 

 5, is only to be seen by removing her from beneath the 

 scale at the proper 

 stage of development. 

 When the young as 

 described above has 

 reached a satisfactory 

 place of abode in its 

 wanderings, it forces 

 its sharp beak or pro- 

 boscis into the bark 

 and draws in the sap 

 of the tree, and begins (J 

 to form its scale. It 

 grows and soon moults 

 its skin, at which time 

 it loses its legs and 

 antenna?, and takes the 

 form represented in 

 Fig. 5. Several broods 

 of this insect occur in 

 a season, the exact number of which is still in doubt, but 

 possibly as many as five. 



Food Plants. 

 The list of food plants of the San Jose scale insect, so far 

 as known, are as follows : apple, pear, peach, plum, cherry, 

 apricot, quince, flowering quince, almond, spiraea, raspberry, 

 rose, hawthorn, cotoneaster, gooseberry, currant, flowering 

 currant, persimmon, elm, osage orange, linden, euonymus, 

 acacia, English walnut, pecan nut, alder, weeping willow and 

 laurel-leaf willow. 



Methods of Distribution. 



As the mature female is wingless, and fixed to the tree on 



which she feeds, she will not be likely to cause other regions 



to become infested unless the tree to which she is attached is 



removed. Her progeny, however, when they are moving 



Fig. 5. — c. An enlarged view of an adult female of the 

 San Jose scale Insect, containing young, d. A portion 

 of its anal fringe still more enlarged. 



