184 
JOURNAL OF ECONOMIC ENTOMOLOGY 
[Vol. 11 
hoppers per square yard. There was a very striking migration of 
poisoned hoppers from the poisoned plots toward eucalyptus and cot¬ 
tonwood trees forming a broken row along one side of the field. The 
poisoned plot at the south end of the row had a total of 234 dead hop¬ 
pers in the 100 square yards of space above mentioned. Beneath a 
tree standing in the southeast corner of this plot 364 dead hoppers were 
counted. Due south of this tree were four others, 31, 54, 66 and 78 
yards distant respectively. Eight poisoned hoppers were found be¬ 
neath the first, three beneath the second and three beneath the third. 
None were found near the tree which was 78 yards distant from the 
poisoned plot. In another experiment where there were no trees to 
attract the poisoned grasshoppers, 40 of the dead insects were counted 
in a poisoned plot 7 yards square. Within 10 yards north of the north 
border there were 20 dead hoppers, between 10 and 20 yards there were 
14 dead hoppers, between 20 and 30 yards 12 dead hoppers. None 
were found more than 27J yards from the poisoned plot. 
Relation of Time of Day to Feeding of Adult Grasshoppers 
In the course of the bait tests reported in this paper records were 
secured which tend to show that in alfalfa fields the adult differential 
grasshoppers feed most actively during the warmer parts of the day 
and less actively toward night. By segregating the records which 
began at 3 p. m. and extended to 6.45 the following table has been 
arranged: 
Table IV— Relation of Time of Day to Feeding of Grasshoppers* 
Date 
Exp. Series 
3-3.45 
4-4.45 
5-5.45 
6-6.45 
July 27. 
B 
128 
84 
56 
21 
July 30. 
C 
150 
143 
58 
43 
July 31. 
D 
68 
50 
37 
18 
Average. 
115.3 
92.6 
50.3 
27.3 
Per cent. 
* 
40.4 
30.3 
17.6 
9.5 
* The figures represent the average of four observations taken on the hour and 
quarter hours. 
The total number of hoppers included in the records was 3,382. 
These records are entirely incidental and it should be said that no effort 
was made to determine definitely whether the attractiveness of the 
baits in the pans remained constant throughout the periods when the 
records were made. It is the writer’s opinion, however, based on 
general observations, that decreasing attractiveness of the baits was 
not an important factor in the results. * 
