THE ENTOMOLOGIST. 109 
“ Ashes and Air-slacked Lime.—This, we found, had been 
extensively used by many of the farmers on the frontier 
districts, but, as far as we could see or learn, without any 
perceptible results. 
“ Suggestions.—Paris-green, which we regard as the most 
practical and efficient remedy for this insect-pest is, unfor- 
tunately, as found in commerce, a substance most variable in 
its composition. Itis an arsenite of copper, and the best 
qualities contain about sixty per cent. of arsenic, on which 
its activity depends, but the inferior grades contain a much 
smaller percentage, and are proportionately less effective, 
and sometimes almost worthless for this purpose. It is 
highly important that the public be supplied with a good 
quality of this useful material, and at as low a price as 
possible, as an encouragement to its use; and we would 
strongly urge on the Department the expediency of making 
such arrangements with the wholesale dealers in Toronto as 
will enable farmers and others to obtain a reliable preparation 
at a stated uniform price. We would further suggest that, 
for convenience sake, the Paris-green be made up in packages 
containing one pound each, with printed directions for its 
use, and cautions regarding its poisonous qualities. We 
would also recommend the Department to strongly urge upon 
farmers to plant in future only such quantities of potatoes as 
they can well look after: one acre, carefully cultivated and 
watched over, wil! probably yield more gross results than four 
or five acres if neglected; indeed, wherever the beetle is 
numerous, negligence is sure to be repaid by the utter 
destruction of the crop.” 
Breeding Zygena Lonicere.—In reply to the editor’s note 
to my paper on the larva of Zygena Trifolii, in the April 
number of the ‘ Entomologist’ (Entom. vii. p. 90), I have on 
only two occasions attempted to rear the larva of a Zygena 
through the winter, and on both occasions the species was 
Lonicere. No difficulty was experienced in keeping them 
alive. In the first brood I kept, some years ago, the larve 
were confined in an ordinary breeding-cage, and, as Mr. 
Newman says, ceased feeding in the autumn very early, and 
when very small, and attached themselves to the sides and 
roof of the cage, though some of them occasionally wandered 
about a little throughout the winter. A great difficulty 
