SCALE-INSECTS, BARK-LICE, MEALY-BUGS. 215 
the insects are found hibernating on the bark, was effectual. 
The insects can also be removed or destroyed by a solid jet of 
water thrown under pressure, which will wash off and crush the 
very soft insects. 
The genus Orthezia is remarkable on account of the cal- 
careous secretion which covers the body in the form of long 
plates. As these insects occur only on various weeds, it is not 
necessary to enter into details. One species is shown in Fig. 
E73 
Fic. 173—Orthezia, enlarged. After Fic. 174—Icerya purchasi. Female, 
Comstock, Div. of Entomology, Dep. adult and young, on orange. 
of Agriculture. After Comstock, Div. of Entomol- 
ogy, Dep. of Agriculture. 
Fic. 176—Kermes-eating-moth. Original. 
