INJURING THE LEAVES. 67 



insert their tiny beaks to suck the sap. Having thus 

 fixed themselves they gradually de- ^; 

 velop, until by fall the females have j^Il 

 attained the shape represented at the ^ 

 left of Fig. 28, and the size shown mp H 

 at the right of the same figure. The 0T : 

 eggs are deposited beneath the scale, < %Hp/' 9 

 and remain in this position until the Jf 



following Spring. Fi £- f ■ ^aleofFe- 



o x o male. Magnified. 



Remedies. — The treatment recommended on a 

 previous page (p. 34) for the < >yster-shell Bark-louse, 

 is equally applicable to the present species. 



INJURING THE LEAVES. 



The Pear-tree Slug. 



Selandria cerasi. 

 The leaves of pear, cherry, quince and plum trees 

 are frequently attacked during June and July by a 

 greenish-black, slimy slug, that eats the parenchyma 

 off the upper surface. Tins is the Tear or Cherry 

 Slug. It originates from eggs laid early in June, in 

 the leaf, by a tour-winged black fly (shown slightly 

 magnified at Fig. 29). The eggs hatch about two 

 weeks after they are deposited, and the larvas become 

 full grown in four or five weeks. They are then 

 nearly half an inch long, and of the form repre- 

 sented at Fier. 29. They now shed their slimy skin, 

 appearing in a clean, yellow suit that is not sticky, 



