46 
surface of the leaves. The larvee work in the leaf, between the upper skin and 
the lower, consuming the parenchyma. They are, when full grown, a quarter of 
an inch long, translucent in appearance, pointed at the head, which is furnished 
with black nippers, and truncated at the other extremity. To pupate they leave 
the plant and enter the soil. The pupa-case (puparium) is chestnut brown. From 
it the fly escapes in about twenty days. (See Dr. Lintner’s Ist Annual Report. 
on the Insects of New York State.) 
The method of dealing with this insect is plainly to break oft the affected 
leaves and to crush them under foot, or throw them into boiling water. 
Lice (Order, Hemiptera). 
THE BEAN LoussE (Aphis faba ?).—A few years ago I found on some Mazagan 
beans that I was growing in my garden at Cowansville, a cluster of plant lice. 
They were lead-coloured and rather large. I had read of the marvellous increase 
of the Aphis, and I resolved to let these specimens on my beans live out their 
life and have their own way. The consequence was, that in a few weeks the 
whole row of beans—and it was a long one—was blackened with Aphides. This 
was quite in accordance with Reaumur’s statement that one aphis can produce 
about 90 young ones, and that in five generations the increase from the one will 
amount to 594,900,000. As the season went on great numbers of the larvee of one 
or two species of Lady-birds (Coccinellidze) appeared on the scene and worked 
great havoc amongst the hosts of the enemy. 
In dealing with a pest such as this, watchfulness and promptitude are re- 
quired. The first clusters of the aphis should be picked off and destroyed. 
THE CaBBAGE Louse (Aphis brassice, Linnaeus).—This insect is often very 
abundant. It is found on the under side of cabbage leaves, and has a whitish, 
mealy appearance. 
Dusting lightly with flour of brimstone has been recommended as a remedy 
for it. 
BEETLES (Order, Coleoptera). 
THE CoLtorapo Potato-BEETLE (Doryphora decem-lineata, Say).—This, the 
well-known Potato-Beetle (Fig. 12) needs no description. Under its normal con- 
Fie, 12. 
ditions, on the slopes of the Rocky Mountains, it fed upon the wild potato, Sola- 
num rostratum. Access to the cultivated plant gave it that increase of vitality 
and fecundity which has rendered it so formidable a foe to the gardener. - yj 
