THE STATE ENTOMOLOGIST. 37 



east, and down the valley of the Ohio river as far as Lewis county, in 

 Virginia. 



This brood is recorded in Ohio as far back as the year 1812, by 

 "A. M. B.," writing to the Chicago Tribune, under date of June 22, 

 1S6S. Harris also records its appearance in Ohio in 1829, and they 

 were quite numerous in Coles county, in the centre of the same State 

 in 1846, or during the first year of the Mexican war, while Dr. Smith re- 

 cords it in the eastern part of the State, extending over twelve coun- 

 ties, west, to the Sciota river, and to Sandusky, on Lake Erie, in 1829, 

 '46 and '63 ; and in Lewis county, Virginia, since 1795. As before 

 stated this brood occurred in Ohio in 1846, simultaneously with the 

 tredecim brood VII in South Illinois. Dr. Fitch, in his account of his 

 5th brood, also records its appearance, and states that it reached to 

 Louisiana. But just as the septemdecim Brood VIII was confounded 

 with the great tredecim Brood XVIII in 1855, so this septemdecim 

 Brood XV was doubtless also confounded with it in 1829, for they both 

 occurred that year. Had the western country been as thickly settled in 

 1829 as it was in 1855, the tredecim Brood XVIII could undoubtedly 

 have been traced in Southern Illinois and Missouri, etc., in the former 

 as it was in the latter year. This belief is furthermore greatly 

 strengthened from our having no other record of the appearance of 

 this septemdecim brood, in Louisiana, than Prof. Potter's statement 

 that they appeared there in 1829, whereas they have occurred there 

 since 1829 at intervals, not of 17, but of 13 years, and were there the 

 present year, 1S68, as will be seen on referring to Brood XVIII. The 

 dividing line of these two broods (XV and XVIII) is probably the 

 same as with broods VIII and XVIII. 



BROOD XVI.— Tredecim— 1SQ7, 1880. 



In the year 1880, being the same as the preceding, they will, in 

 all probability, appear in the north part of Cherokee county, Georgia, 

 having appeared there according to Dr. Smith in 1828, '41, '54, and ac- 

 cording to Dr. Morris, in 1867. This brood occurred in 1867 simultane- 

 ously with the northern septemdecim brood XXI. 



BROOD XVII.— Septemdecim— 1864, 1881. 



In 1881, and at intervals of 17 years thereafter, they will, in all 

 probability, appear in Marquette and Green Lake counties, in Wis- 

 consin, and may also appear in the western part of North Carolina, 

 and about Wheeling, Virginia; in Northeast Ohio, and a lew in Lan- 

 caster county, Pa., and Westchester county, New York. 



There is abundant evidence that they appeared in the counties 

 named in Wisconsin in 1864, and fair evidence that they appeared that 

 year in Summit county, Northeast Ohio, while straggling specimens 

 were found in the same year, by Mr. S. S. Rath von, in Lancaster coun- 

 ty, Pa., and by Mr. James Angus, in Westchester county, N. Y. Dr. 

 Fitch also records their appearance in 18 17, or 17 years previously, in 



