506 Annual Report of New York 
alkali that the lice would for a while be repelled from again locating 
themselves thereon; hut I now saw it had no such effect. 
After the check they had now received they did not again multiply 
to throng this bush oppressively. They continued to infest it, however, 
till the close of the season. The green new twigs that put forth at 
the end of the limbs soon grew to be too hard and woody to be 
adapted to their wants, and it was only on the under side of the 
leaves that they were met with during the summer and autumn. 
And the leaves were then become so firm and rigid that their punc¬ 
tures ceased to wrinkle or have any other perceptible effect upon 
them. 
The center of the under side of the leaf is the point where these 
lice are usually stationed. Here most commonly but one or two, but 
sometimes six or even nine or twelve small young lice were located 
—foundlings, forsaken by their parents — the winged females being 
accustomed to alight upon a leaf and give birth to one or two young, 
and then fly away, but in some instances remaining until ten or twelve 
young are deposited. Sometimes two winged females are found on 
the same leaf. Much the larger portion of the young lice appear to 
be the offspring of winged parents. As they have occurred to my 
observation, wingless females are much less numerous than winged 
ones in this species. They are met with on the leaves with their pro¬ 
geny huddled closely around them. I suspect, however, that they do 
not place all their young upon one leaf; after a number have been 
deposited I think they leave them and wander away to another leaf. 
I once saw a wingless female travel quite a distance from a leaf on 
which were four young lice, but I had no assurance that these were 
her offspring. 
In several other species of plant-lice which I have observed, the 
wingless females are twice as prolific as the winged ones. In each 
of these species the wingless females uniformly give birth to four 
young and the winged ones to two, in twenty-four hours. In this 
bean aphis the wingless appear to be little, if any more, prolific than 
the winged females. In June I imprisoned a wingless female and 
also two winged ones, during two nights and one day, at the end of 
which time I found three young lice with the wingless female, and 
five with the winged ones. But they will probably be found to be 
more prolific than they were in this instance. 
Mr. Curtis (Farm Insects, p. 356), says : “ Where the eggs are laid 
remains a mystery. It cannot be upon the beans, and as the apterous 
specimens are the precursors of the winged ones, they are not able to 
