9) 
have learned to attack it, and, in the case of the insects, they have 
multiplied until now they are recognized as important factors in 
the control of the beetle. The species is interesting also as having 
led to the first use of an arsenical insecticide, Paris green, on edible 
plants. Fortunately, with a knowledge of the habits of this insect, 
SS WN 
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5 
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Vic. 2.—Section of potato plant showing Colorado potato beetle at work: a, Beetle; 0,b, 
egg masses; c,c, half-grown larvee; d,d, mature larve. Somewhat enlarged (original). 
the use of arsenicals, and the friendly assistance of natural enemies, 
the grower may hold it in practical subjection. 
DESCRIPTIVE. 
The Colorado potato beetle is so well known that a description 
seems hardly necessary for most persons, but that there may be no 
[Cir. 87] 
