168 



MONTANA EXPERIMENT STATION. 



together. With the awakening of nature in the spring these eggs 

 hatch into minute whitish larvae which crawl out from under the 

 parent scale and go to suitable spots for settling down. These 

 larvae go mainly to the tender new growth. In the Xorth there is 

 but one brood but farther south there are two. 



This scale insect is present in a few localities in the state and 

 has been very prolific and troublesome. 



eggs; b, same from above, greatly enlarged; c, female scales; d, male scales, 

 natural size. (Howard, Year-book, U. S. Dept. of Agr.) 



Fig. 16. Oyster-shell Bark-louse: a, female scale from below showing 



