THE STUDY OF INSECTS. 
168 
Mealy Bugs are the most common and the most noxious of 
green-house pests; and in the warmer regions, as in Florida, 
they infest plants in the open air. Two species are shown 
greatly enlarged in Figures 204 and 205. These insects are 
extremely difficult to combat, as the white powder with 
which the body is clothed protects them from the sprays 
and washes ordinarily used. 
Kernies .—Species of this genus are common upon oaks 
wherever they grow. These insects are remarkable for the 
wonderful gall-like form of the adult females. So striking is 
this resemblance, that they have been mistaken for galls by 
many entomologists. Figure 206 represents a species of this 
genus upon Quercus agrifolia . The gall-like swellings on the 
stem are the adult females; the smaller scales on the leaves 
are the immature males. 
Orthezia (Or-the'zi-a).—The members of this genus 
occur not uncommonly on vari¬ 
ous weeds. They are remark¬ 
able for the calcareous’secretion 
with which the body is clothed. 
This is in the form of long 
plates. Figure 207 represents 
a nymph; in the adult female 
the secretion becomes more 
elongated posteriorly, and 
forms a sac containing the eggs 
mixed with a fine down. Later 
1 
when the young are born, they 
remain in the sac till they have 
themselves secreted a sufficient 
FlG ' 3 £' Aufhor4l a eVor n tYo?, d 88 0 !r rora amount of tile lamellar matter 
to cover them. 
Pulvinaria (Pul-vi-na'ria).—This genus includes species 
in which the body of the female resembles Lccanium, de¬ 
scribed below, but which excrete a large cottony egg-sac. 
This egg-sac is not ribbed, but is of the form shown in 
