40 THE CHINCH BUG. 
Thai the amount and frequency of rain during the month of Mai 
has very much to do with the ravages of chinch bugs when' sufficient 
numbers have wintered over to produce the requisite number of 
young, is further shown by the fact that in L894 the only locality 
where serious ravages were committed was in Wyandot County, as 
shown on map (fig. L3), and this was one of the few area- in Ohio 
where the precipitation during that month was less than 3 inches. 
Rainfall 
Chinch Bug 
'Areas infested §8&fGreatly infeste 
Under 
1 inch 
— 1 to2= 
- 
Er2t~4= 
lOwr-Asj 
Fig. 11. Map showing distribution of cnincb oug in Ohio in 1895, :m<l amount of pre 
cipitation over the State during May of the same year. (Author's illustration.) 
Except over a circular area covering less than one-half of the county 
the amount of precipitation was 3 to 5 inches, and this area includes 
that ravaged by the chinch bugs during the following month. 
Still more striking, however, is the relation between the two 
phenomena during the following year. The last of this series of 
map- (fig. I I ) shows the area over which chinch bugs were reported 
