INFLUENCE OF PRECIPITATION ON CHINCH BUG. 39 
area seriously ravaged is indicated thus #, showing that the rain 
came too late in such a section to ward off an outbreak of the pest. 
According to the Weather Bureau reports also, the distribution of 
rain in May, 1897, differed materially from that of the same month 
of 1896, in that in 1897 the major portion of the rain fell prior to 
the 15th, the remainder of the month being rather dry, the only 
general precipitation occurring on the 23d and 24th, with a much 
ASMTABULA 
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COSHOCTON HARRISON 
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Fic. 13.—Map showing distribution of chinch bug in Ohio in 1894. (Author’s illustration.) 
lighter rain on the 28th. But here again the amount was insufficient 
to’ ward off serious injury, as is indicated by map (fig. 12), the same 
symbols being used here as before. In this case it was probably the 
latter portion of the brood that survived, as a personal inspection 
of the country early in the month failed to reveal the presence of 
young bugs, though they were certainly present in abundance at a 
corresponding period of the preceding year. 
