REPORT OF THE STATE ENTOMOLOGIST igi2 5 1 



twitching of the forelegs. Another dropped at 4.30 and the remain- 

 ing two at 4.50, all being dead the following morning. 



Arsenate of lead sweetened. The first beetle dropped at 4.05 

 showing feeble evidences of life, a second at 4.45 and at 5 p. m. 

 the other two were alive. The next morning a third was dead in 

 the jar, the fourth remaining upon the foliage. It was alive at 10 

 a. in. May 17th and at 9 a. m. the 18th. 



The insects confined in the jar with unpoisoned foliage contin- 

 ued in a vigorous condition till the 20th, even though the leaves 

 were badly shriveled. 



These experiments were duplicated, the only difference being 

 that the sand was covered with blotting paper and the beetles 

 placed directly upon the leaves at 2.15 p. m. May 16th. 



Arsenate of lead plain. One beetle had dropped at 4.20, the 

 others being alive at 5 p. m. The next morning another was dead, 

 a second on the sand and moving a little, motion ceasing at 9.45. 

 The last remained on the foliage and was alive on the 20th, being 

 dead at 9 a. m. the 21st. 



Arsenate of lead sweetened. At 3.30 p. m. one had dropped, at 

 3.35 another, and a third at 4.05, the fourth being alive at 5 p. m. 

 and dead at 8.45 a. m. the following morning. 



Two other beetles from the same lot as the preceding were put 

 in a jar with a blotter saturated with the sweetened poisoned spray 

 at 10.30 a. m. May 18th. They appeared to be imbibing the mix- 

 ture and were found dead on the 20th. 



The above experiments were conducted with beetles which had 

 not fed since the preceding fall and were presumably very hungry. 

 The results show that the insects succumb to poison quickly under 

 such conditions, and that in some situations it may well pay to 

 begin spraying as soon as the insects commence feeding, though 

 it is doubtful if the results secured would warrant the general 

 adoption of this plan. 



Tests conducted by the writer over a decade ago showed that 

 beetles collected from elm foliage and confined in jars containing 

 leaves sprayed with poison, fed very little for a day or two, event- 

 ually being forced by starvation to devour the distasteful food, all 

 finally succumbing within a week or two. These results are 

 markedly different from those detailed above, and the experiments 

 of 1899 were duplicated in part last spring and substantially the 

 same data obtained. Arsenate of lead was used at the rate of 4 

 pounds to 50 gallons of water and the spray allowed to dry before 



