15 
value. Practically all substances applied to vines to render them 
obnoxious to the beetles have proved of little value, but a correspond- 
ent reports having successfully protected his vineyard last summer 
by spraying with a wash made by diluting 1 gallon of erude ear- 
bolic acid in 100 gallons of water. The arsenicals are available only 
when the beetles are not very numerous; otherwise their ranks are 
constantly recruited by newcomers, and under these circumstances all 
insecticides, however effective ordinarily, are unavailable. When this 
is the case, the only hope is in collecting the beetles or in covering 
and protecting plants with netting, or later in bagging grapes. Ad- 
vantage may be taken of their great fondness for the bloom of spireea, 
R 

Fia. 8.— Macrodactylus subspinosus. a, beetle; b, larva; c and d,mouth-parts of same; e, pupa; 
f,injury to leaves and blossoms with beetles, natural size, at work (original). 
and rows of these flowering shrubs may be planted about the vine- 
yard to lure them and facilitate their collection. 
They may be gathered from these trap plants, or the grapes them- 
selves, in large hand beating nets, or by jarring into large funnel- 
shaped collectors on the plan of an inverted umbrella. The latter 
apparatus should have a vessel containing kerosene and water at the 
bottom to wet and kill the beetles. 
All measures must be kept up unceasingly if any benefit is to be 
derived. 
The numbers of the rose-chafers may be considerably limited by 
restricting the areas in which they may breed. All sandy meadow 
