143 
Aphis, sp. Plant-louse. 
u s P ec ies of plant-louse belonging to the genus Aphis, but not 
ermined as to species, because only the wingless female has yet 
n seen, was common at Centralia, in Southern Illinois, in No- 
lber, 1882, at which time it was concentrated upon the crown of 
plant, and upon the main root, between the bases of the fibrous 
Is, just beneath the surface of the ground. 
s it doubtless occurred upon the leaves earlier in the season, 
ias been treated more at length on another page, under the head 
nsects affecting the foliage. 
i ■ 
2 . Gnawing and perforating the substance. 
i 
i 
a. Hard, straight, slender, cylindrical larvae (wire-worms). 
mm 
Wire-Worms. 
i 
i 
Elateridce . 
[Plate VII, Figs. 4 and 5.1 
iese well-known insects are treated at some length in the sixth 
rt of this office (pp. 21 to 32), where strawberries are mentioned 
ng the plants subject to their attack; and to that article the 
er is referred for a sufficient discussion of them. 
White grubs, four or five times as long as wide, with abdomen 
at least twice as long as head and thorax, and with tip of 
body swollen, rounded and smooth. 
k 
The White Grubs. 
Lachnosterna , sp. 
Cotalpa lanigera, L. 
Allorhina nitida, L. 
j e above species, to be treated at some length under the head of 
its injurious to the fibrous roots, are mentioned here also be- 
} they likewise devour the main root of the strawberry, often 
inly killing the plant. 
