! following observation bears upon the relation of the root and 
forms to each other. On the k 25th of June a number of the 
orm were colonized on the roots of corn growing in the labor- 
and on the 5th of July one of these lice was observed to have 
ished itself upon one of the leaves. On the 6th of July it was 
to have given birth to two young during the preceding night, 
p of the root lice were observed upon the leaves, but the plant 
8 stage began to die, and the experiment ended. I have little 
, however, that this would have proved the beginning of a 
7 of aerial corn lice. 
the light of these observations, the history of the lice during 
"ear seems to be this: Reproduction is carried on during the 
months by the viviparous (mostly wingless) females of the 
form. In the fall viviparous winged females predominate, 
g to distribute the species and (generally) by hibernating pass 
l* the winter months. In the spring these females resort to the 
and bases of the stems, where they are then protected from 
>ld, and multiply here until the warm weather of the latter 
)f July sets in, when their descendants migrate to the leaves, 
| and silks, founding there the colonies of aerial lice. 
account of the life history of this plant louse would be imper- 
L/ithout some notice of the little ant. Lasius flavus. In the spring 
lit is almost invariably to be found with the root lice, carefully 
ing the latter, and when the burrows are exposed carrying them 
and concealing them in the earth. During the fore part of 
ler it occurs on the plants among the aerial lice, but when the 
bason of late August and early September sets in, it burrows 
into the earth and is not often seen except after rains, when 
ns up its burrows. With the fall rains it again comes to the 
!;e and may be found to the end of the season with its young 
olonies of Schizoneura panicola on the roots of grasses. Its 
se in attending the corn louse is doubtless to secure the sweet 
which a tap from an antenna will cause a full fed louse to 
p But I am disposed to believe that the ants attend Schizo- 
panicola for the purpose of browsing upon the waxen coat 
covers that species. I have several times seen the ants gath- 
ibout a detached mass of this wax and apparently eating it. 
j tne nests of these ants one finds in winter masses of plant lice 
vhich have been collected the previous fall. The ants carry 
about as the do the plant lice. Why they are collected, I am 
[e to say. A natural inference is that they collect them to stock 
15 in the vicinity of their nests in the spring.! It may be they 
8ed as food, as, indeed, from the results of some experiments 
jping them indoors I suspect the lice are occasionally. 
I-- 
L 
iring the past summer I have repeatedly seen the ants secure this favor, and to 
prise the sweet droplet was always discharged from the vent, never from the 
as. 
j quantity of these eggs were collected last spring and giveD to a colony of ants 
I doors. They hatched small green plant lice which at once scattered in all di- 
i s. They would not make their home on any of the plants offered them, and so 
1 st. 
Kf • - * 
