State Agricultural Society. 
507 
transport themselves in the first instance.” As the wingless females 
are not able to transport themselves, it is evident that it must he by- 
winged females that the first lice are placed upon the bean and most 
other plants. And there being an abundant supply of food for them 
on the bean tops, whereby they have no occasion for migrating else¬ 
where, the first generations mature into wingless females. But when 
the bean or other plant becomes overstocked and so crowded that there 
are no accommodations for any further numbers thereon, it is winged 
females that are developed, which will be able to fly away and find 
food and situations for their young elsewhere. I thus infer, from 
having found them all growing into winged females so early in the 
season as the first of June, upon the burning bush when it had 
become fully occupied. 
Where the eggs are laid and how this insect is carried through the 
winter has hitherto been a mystery, as Mr. Curtis observes. Upon 
this important point I am able to shed some light. When examining 
a pigweed on which were some clusters of these black lice the latter 
part of October, I discovered a smooth shining egg, of a dull green 
color, adhering to a dry and crinkled dead leaf, and another crowded 
into a crevice of another dead leaf. These eggs had no doubt been 
quite recently placed in these situations. Later in the season I 
examined several other infested weeds, but was unable to find any 
eggs upon them. In November, meeting with a weed that was 
thronged with pupae, I transplanted it into a flower pot and brought 
it in doors, to ascertain whether on maturing and having no other 
place to lay their eggs, they would stock this plant with them. But 
on acquiring wings they all flew away without making any deposit 
thereon. It was therefore evident that the two eggs which I found, 
were only placed on the dead leaves by accident, and that these insects 
do not lay their eggs upon the plants which they inhabit, or at least 
upon those which decay at the end of the year. 
It has heretofore been shown in these Reports that the aphides do 
not perish on being frozen and that, in some instances at least, they 
survive the rigors of winter and return to life with the return of 
spi ing. And on noticing such numbers of these winged lice coming 
forth on the very verge of winter, and so late in the season that the 
inclement weather would scarcely admit of their then making a 
deposit ot their eggs, I have been impressed with the belief that a 
portion of these flies would gain coverts where they would gradually 
become torpid from the advancing cold of the season and would be 
protected from injury during the winter, whereby with the return of 
