51 
these locusts among the w«M-ds also infested by the Blister-beetles, it is 
very probable that the latter while in the larva state bad fed upon tin- 
eggs of the locusts. This supposition appears to be rendered all the 
more probable by the farther fact thai in the immediate vicinity of these 
beetles the locusts did not occur in large numbers, nor had the orchards 
and vineyards in this locality been seriously injured by them. The 
fact recorded above that the larvae of other species of Blister-beetles 
belonging to the same genus are known to feed upon the e^^s of locusts 
renders it almost certain that the present species while in the larva 
state also feeds upon the eggs of these insects, and would, if sufficiently 
plentiful, keep the locusts so reduced in numbers that it would be im- 
possible for them to become numerous enough to occasion any wide- 
spread injury to cultivated trees and plants. Unfortunately there ap- 
pears to be no method whereby we can secure the more rapid propaga- 
tion of these and the other natural enemies of the locusts, and our 
only recourse therefore is to subdue these pests by artificial means. 
REMEDIES. 
I have already stated the fact that when the locusts appeared in or- 
dinary numbers they were effectually destroyed by the use of the bran 
and arsenic mixture, composed of the following ingredients in the pro- 
portions here given : 
Pounds. 
Bran 100 
Arsenic 16 
Sugar 16 
Water sufficient to thoroughly wet the mixture. 
The bran is placed in any convenient receptacle, and the arsenic 
added to it dry; the two are then thoroughly mixed together with a 
shovel, spade, or other instrument. The sugar is then dissolved in cold 
water and afterwards added to the bran and arsenic mixture and the 
whole thoroughly stirred; if this is not sufficient to wet the mixture, 
enough cold water should be added to accomplish this, and after being 
thoroughly stirred, the mixture is ready for use. In applying it. some 
persons sow it broadcast by hand in the orchards and vineyards, while 
others simply drop about a teaspoonful of the mixture at the base of 
each vine or tree. By the latter method about 10 pounds of the bran 
and If pounds each of sugar and arsenic will be required tor each acre 
of grapevines. The cost of the materials and of t lie labor in preparing 
and applying this mixture will not much exceed 50 cents per acre of 
grapevines, while in the orchards the cost will be much lower than 
this. 
The addition of the sugar is simply tor the purpose of causing the 
arsenic to adhere to the particles of bran, and not for the purpose of 
rendering the mixture more attractive to the locusts, since 1 ascertained 
