ties adjacent. The northernmost locality in which an infestation was 

 found was in the northern part of Fayette county. (Map 1.) 



By the summer of 1911 the smaller, northern end of this pear- 

 shaped area had so developed to the north and west as to make a much 

 larger district of infestation, still pear-shaped, but with the larger end 

 of the figure now northward. Fourteen counties were involved, seven 

 of them lying wholly within the infested area, the northern boundary 

 of which reached to the southern part of Christian county and the 

 northern line of Macoupin. A tendency of the expansion to the east- 

 ward was shown by threatening numbers of chinch-bugs at single lo- 

 calities in Franklin and Jasper countries. (Map 2.) 



During 1912 the infested district was widened and extended north- 

 ward to assume a triangular form, with the Mississippi River between 

 Jackson and Pike counties as one side of the triangle and with Cum- 

 berland county at its peak. (Map 2.) Eleven counties were now 

 wholly included in it, and a considerable part of twelve counties ad- 

 ditional.. The northernmost point of serious infestation this season was 

 in the southern fourth of Sangamon county. The severity of the at- 

 tack was noticeably lessened in the southernmost counties infested, 

 altho local crop injury in Hamilton and Saline counties showed that 

 conditions to the southeast were barely below the danger line. 



In 1913, (Map 3) altho there was a slight expansion of the area 

 of injury to the northward to include the whole of Greene and Cal- 

 houn counties, the number of counties affected was reduced to eighteen, 

 the southern and eastern angles of the area occupied in 1912 being 

 now withdrawn or rounded off in a way to give the whole tract an ir- 

 regularly hemispherical or semielliptical form with the central parts 

 of Shelby and Marion counties at its eastern boundary and central 

 Randolph at its southernmost extension. 



There had developed by this time in parts of Madison and Ma- 

 coupin counties a center of intense infestation within which nearly all 

 crops liable to destruction were practically obliterated; and these 

 conditions became still more serious in 1914 when the outbreak reached 

 its climax. In this year (1914) the spring flights of chinch-bugs from 

 their winter quarters brought them to our notice as destructively 

 abundant either in wheat or corn over the whole of fifteen counties 

 and in considerable parts of eleven others, the additions to the area 

 occupied being almost wholly to the northward. (Map 4.) The north- 

 ernmost line of the chinch-bug territory of this year ran a little above 

 the southern boundaries of Adams, Brown, and Cass counties; and its 

 farthest eastern boundary was in Effingham county. A center of vir- 

 tually complete destruction lay in the counties of Jersey, Macoupin. 

 Montgomery, Fayette, Bond, and Madison, within which it formed 

 an oval tract about seventy-five by forty miles in greatest length and 

 breadth. The mid-summer flight of the first generation of the bugs 

 carried them so far outward in all directions that the fall inspection 



