THE MICROSCOPE 



SEPTETs/EBER, 1896. 



Number 45 New Series 



Objects Seen Under The Microscope 



BY CHRYSANTHEMUM. 



XXXIV. — Oyster Shell Bauk Louse and Scurfy 

 Bark Louse. 



The Oyster Shell Bark Louse is found upon tlie apple, 

 pear, quince, hawtliorn, ])Uckhorn, raspberry, currant, 

 limhiii, hop tree, bhadder nut, horse-chestnut, maple, water 

 locust, liouey-suckle, ash, elm, willow ami otlitTs. It has 

 somewhat the xliape of the oyster-shell, and ^eufrally 

 attacks tlie young twigs or trunk of the tree. They are 

 sometimes, though rarely, fomul nn leaves or fruit. This 

 in northern countries would mean certain death as they 

 there have hut one brood in a season, but in the south they 

 have two broods. 



If, during the winter, one of the scales be lifted, it 

 will be found to contain the shriveled body of the dead 

 female, under the more pointed portion of the scale, 

 while behind this, the scale will be seen filled with eggs, 

 white unless near the hatching period, which in tlie 

 northeastern states is in May or early June, when tliuy 

 will be yellow. The eggs vary in number from 42 to 86 

 and when hatched, the young wander upon the twigs, and 

 settle at once and commence to form the scale. 



After inserting its beak and settling, the female molts 

 twice, and begins the formation of the scale, which is 

 secreted mainly from the hinder portion of the body and 

 extends backwards. The insect has two molts and the 



