34 
the bushes examined which contained any colonies without the winged 
mother or where there was the slightest evidence of the previous 
presence of aphides; no cast skins from old colonies or damaged leaves, 
and every indication went to prove that the winged form had just settled 
upon the trees and begun the formation of colonies. While perhaps of 
little value as proof, it may also be mentioned that no Schizoneure had 
been observed on Cornus this fall prior to this date or before the swarm- 
ing of September 15. A number of branches containing colonies were 
brought in and kept in water for the purpose of folowing their devel- 
opment. This was fortunate, as the colonies on the plants out of doors 
were almost all depopulated a few days later by predaceous insects, 
so much so that the colonies on plants near at hand and on which I 
depended for following the species out of doors utterly failed to furnish 
material for that purpose. Indoors the insects developed rapidly and 
were followed as closely as circumstances would permit. Molting in 
these occurred by the 19th, and apparently only one molt occurred 
before maturity. Only one brood was developed, these becoming sex- 
ually mature September 25. Both males and females were apterous 
and copulation took place upon the leaves and also upon the twigs, the 
females often traveling down the twigs and branches while copulation 
was in progress. In every case the females seemed to travel down the 
branches as far as possible before depositing eggs, and great numbers 
of them dropped into the water in which the branches were kept. In 
the woods I have been unable to find any eggs whatever under buds on 
twigs, and so far as the indoor observations go they differ from those 
recorded by Mr. Weed. Whether this be due to dryness, the insects 
seeking a place of some degree of moisture, can be determined by com- 
parisons under varying conditions. . 
Two weeks after the swarming of winged lice in the air there was 
another swarming, though the lice were not so numerous as at the first 
time. This swarming also followed a rain with subsequent cold. As 
in the preceding case, examination of Cornus in the woods showed nu- 
merous winged individuals starting colonies, though at this time in 
some places it was possible to find the cast skins of previous colonies, 
all of which, however, so far as I could find, had been destroyed by 
predaceous insects or other causes. My search for eggs in the woods 
has been futile, and it would seem that nearly all the colonies were de- 
stroyed before the maturity of the sexual individuals. I have feund, 
however, oval bodies a trifle larger than the eggs, but resembling them 
at first sight, though flattened, but which prove to be a small species 
of Lecanium, apparently undescribed. 
The lice occurring on the roots of grass, and which were placed in 
breeding jar the 16th, were mostly unaltered on the 19th, but in the jar 
I found a fully winged specimen, agreeing exactly, so far as could be 
seen with hand lens, in the living individual, with specimens flying and 
also with those on Cornus. It was transferred to a leaf of Cornus on 
