INFLUENCE OF PRECIPITATION ON CHINCH BUG. 4] 
and the area where their injuries were the most severe; also, by 
horizontal lines, the areas over which the amount of precipitation 
was the least. From this it will be observed that in all of the seri- 
ously affected area, and in nearly all of the area over which the 
pest was reported at all, the precipitation during the month of May, 
1895, was from 1 to 2 inches,.the extension of the point westward 
into Shelby County being especially interesting. It may be said 
with regard to the occurrences outside of this area of light precipita- 
tion that the exact localities were probably not indicated, as the 
information was secured from farmers, and their locations as indi- 
cated on the map were their post-office addresses, which might have 
been several miles away in any direction, and the isolated points of 
attack were often based upon one or two reports. If exact localities 
could have been obtained, and the precise area of precipitation indi- 
cated, the connection between the two phenomena would have been 
shown more correctly, and would probably have revealed an even 
greater uniformity than is now apparent. It must be understood, 
however, that in these calculations northeastern Ohio is excluded, 
and the writer believes that what is true of the rest of the State 
will be found to be equally correct as regarding territory occupying 
the same latitude westward to the limit of this area of distribution. 
While it is probable that the effect of precipitation during August 
would have a similar influence on the second brood of young, and, 
consequently, upon the number of adults which would go into winter 
quarters, yet a careful study of the two factors shows that meteoro- 
logical conditions in August have a far less influence upon the fol- 
lowing brood than do those of May. 
Owing to causes which are as yet unknown to the writer the same 
laws do not apply to the northeastern part of Ohio and to what we 
have termed the west-bound tide of migration. Here, and as against 
the more or less short-winged form of chinch bug, meteorological con- 
ditions appear to exert a far less potent influence. What is true of 
meteorological conditions during May elsewhere in Ohio, seems to 
be partly true of June in the northeastern portion of the State, 
though there is not the evidence of the effect of precipitation here 
that we have elsewhere. Doctor Lintner, in his Second Report, while 
discussing the outbreak of the chinch bug in New York during 1882-83, 
calls attention to the fact that both in 1881 and 1882 there was an 
excess of precipitation. On page 158 of his report Doctor Lintner 
says that spring, summer, and autumn were exceptionally wet. In 
spring heavy and continued rains flooded meadows which, later, 
showed the effect of chinch-bug attack. Even at haying time while 
the bugs were young and, according to all accounts, easily killed 
by heavy rains, they persisted in multiplying and living despite 
the fact that rains were so freauent and severe that only a portion 
