143 
Apuis, sp. Plant-louse. 
A species of plant-louse belonging to the genus Aphis, but not 
determined as to species, because only the wingless female has yet 
been seen, was common at Centralia, in Southern Illinois, in No- 
vember, 1882, at which time it was concentrated upon the crown of 
the plant, and upon the main root, between the bases of the fibrous 
roots, just beneath the surface of the ground. 
As it doubtless occurred upon the leaves earlier in the season, 
it has been treated more at length on another page, under the head 
of insects affecting the foliage. 
2. Gnawing and perforating the substance. 
a. Hard, straight, slender, cylindrical larve (wire-worms). 
Wire- Worms. 
Elateride. 
[Plate VII, Figs. 4 and 5.1] 
These well-known insects are treated at some length in the sixth 
report of this office (pp. 2: to £2), where strawberries are mentioned 
among the plants subject to their attack; and to that article the 
reader is referred jor a sufficient discussion of them. 
b. 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. 
Tur WuHuitE GRvUBS. 
Lachnosterna, sp. 
Cotalpa lanigera, L. 
Allorhina nitida, L. 
The above species, to be treated at some length under the head of 
insects injurious to the fibrous roots, are mentioned here also be- 
cause they likewise devour the main root of the strawberry, often 
suddenly killing the plant. 
