The Scale Insects 



day it is present even in California. It is by no means confined 

 to apple and pear, but is also found upon quince, hawthorn, 

 buckthorn, rarely upon raspberry and currant, but also upon 

 linden, hop tree, horse chestnut, maple, water locust, honey- 



Fig. 151. — Mytilaspis pomorum : adult male and female. (Author's illustration.) 



suckle, ash, elm, hickory, cottonwood, willow, poplar, wild 

 grape, rose, fig, bitter-sweet, red maple, black ash, white ash. 

 white birch, red birch, and very abundantly upon the lilac, so 

 that it will be an easy form to collect and to study. In the 

 winter time, if one of the oyster-shell shaped scales is lifted 

 gently with the point of a needle, it will be found to contain at 

 the narrow front end the shriveled body of the female with from 

 50 to 100 yellowish white eggs packed closely together behind 

 the body. Sometimes the eggs will be found to be very few in 

 number, but then the larva or pupa of a little chalcidid parasite 

 will be found under the scale, which will account for the destruc- 

 tion of the eggs. In most of the northeastern states the young 

 hatch from these eggs during the latter part of May or early in 

 June (at an earlier date farther south), and wander out upon the 

 twigs and settle at once. The young twigs are the only parts of 



256 



