130 PERIODICAL CICADA. 



In the "Prairie Farmer" for July 29th, a brief outline of the locust 

 range was published by Mr. Suel Foster, of Muscatine, Iowa ; but in 

 this outline, as Mr. Foster himself stated, many gaps were left undeter- 

 mined. I have found Mr. Foster's outline to be, in the main, correct, 

 and have filled, as far as possible, the gaps which he left. I will take 

 the same starting point with Mr. Foster, namely, the junction of the 

 Iowa river with the Mississippi, in Louisa county, Iowa. Thence, in a 

 northwesterly direction, following the eastern branch known as the 

 Cedar river, as far north as about opposite the mouth of the Wisconsin 

 river. Thence east, in about the same line of latitude to Lake Michi- 

 gan, following the Wisconsin river so far as it lies- in this line, thus 

 leaving out the northernmost counties of Iowa, and including the two 

 lower tiers of counties of Wisconsin. Thence, southernly around the 

 lower extremity of the lake, and taking in the northwestern corner of 

 Indiana, as far south as the Kankakee river. 'If they extended at all 

 into Michigan, it could only have been a little over the line, as advices 

 from Kalamazoo, and from two witnesses in Benton Harbor, agree in 

 certifying that no locusts were seen in those localities. Thence, taking 

 our departure from about the point where the Kankakee river crosses 

 the Indiana border, the locust line takes a southwesternly direction 

 through Iroquois county, till it strikes the head waters of the Sangamon 

 river, in the northwestern corner of Champaign county. From this 

 point, the Singamon river seems to have formed very nearly the south- 

 ern border of the locust range. By looking upon a map it will be seen 

 that this river takes, first, a southwesternly and then a westernly direc- 

 tion, till it reaches the vicinity of the city of Springfield, which seems 

 to have baen the southernmost limit of these insects. Thence, the locust 

 line continues to follow the river, first nerthernly, through Menard 

 county, to the northern boundary of said county, and then west on the 

 dividing line between Cass and Mason counties, to its junction with the 

 Illinois river. From this point there appears to have been a gap in the 

 locust line until we reach the southern part of Peoria county, a little 

 below the entrance of the Mackinaw river, in Tazewell county, into the 

 Illinois, where the locusts were abundant. From the southern point 

 of Peoria county the line strikes northwest, taking in the northeast cor- 

 ner of Fulton county, and continuing through Knox county on about a 

 line with the city of Galesburg, where only a few locusts were seen. 

 Thence north, to the eastern border of Mercer county, and thence west, 

 through the middle of Mercer county, following, in the main, the course 



