34 
THE CHINCH BUG. 
just at the close thereof, thus enabling the major portion of the young 
to reach a period in their development wherein they are little, if at all, 
susceptible to the effects of drenching rains. This was clearly illus- 
trated in southern Ohio during the spring of 1896, and again in 1897. 
Throughout southern Ohio, in 1896, between latitude 38° 30' and 39° 40', 
as the reports of the United States Weather Bureau show, there had 
Fig. 9.— Map showing distribution of chinch bug in Ohio in 1894 (from Bull. Ko. 6, n. s.). 
been but very little rain up to May 11, and no general rain until May 25. 
The effect upon the young bugs, judging from the destruction which 
they caused, would seem to have been to destroy only the latest to 
hatch, leaving the earlier developing young sufficiently advanced to 
withstand the effects of the later and heavier rains. The accompany- 
ing map (fig. 7) will show the areas over which chinch bugs were 
reported marked thus M, while the area seriously ravaged is indicated 
