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Vol. XXIX. LONDON, OCTOBER, 1897. No. 10. 



BROOD XV. OF CICADA SEPTENDECIM IN OHIO.* 



BY F. M. WEBSTER, WOOSTER, OHIO. 



Having had the opportunity of working out the distribution of broods 

 v., VIII. and XXII. in Indiana, brood XV. in Ohio possessed a peculiar 

 interest for me, as in studying it I was able to profit considerably by my 

 acquaintance with the others. I perhaps ought to say a word in regard 

 to the three other broods mentioned, as one of them (XXII.) is treated of 

 at considerable length in the Report of the Entomologist of the United 

 States Department of Agriculture for the year 1885, and it was while 

 connected with the Department as one of its special agents that these 

 three broods were studied. Brood XXII. covered the entire State of 

 Indiana, except a narrow strip of land around the lower end of Lake 

 Michigan, from ten or fifteen to twenty miles wide, which area was exactly 

 covered by brood V. in 1888. The coloured map which accompanies the 

 report mentioned is defective in that the two points extending southward, 

 not indicated as being covered by this brood, were, as was afterwards 

 learned, within the area covered by brood XXII. and not covered by 

 brood v., the line of separation being about ten miles east of the lake on 

 the line between Michigan and Indiana, and running nearly south-west 

 to the east line of Porter county, the course then trending slightly more 

 to the westward to the Illinois line ; in no case, I believe, extending to the 

 Kankakee River, thus making the line of separation much more uniform 

 than the one indicated on the map cited above, on which the dividing line 

 is quite irregular. 



Brood VIII. occurred in southern Indiana, becoming excessively 

 abundant only in Harrison county, but covering the area south of a line 

 drawn from Vincennes to Greencastle, Franklin, and eastward to northern 

 Dearborn county. Singularly enough, a single female was brought me at 

 Lafayette, fully 60 miles north of Greencastle, which probably marked the 

 northernmost point where the species could be said to occur in any numbers. 



* Read before Section " F," Zoology, of A. A. A. S., at Detroit, Michigan, August 

 1 0th, 1897. 



