Pennsylvania: Counties of Dauphin, Lancaster, Northampton (and 

 adjoining counties), Philadelphia (Germantown), Westmoreland, 



Virginia : County of Smyth. 



West Virginia : County of Ohio (Wheeling) (??). 



Wisconsin : Counties of Columbia, Dane, (Ireen Lake, LaCrosse, 

 Marquette (?), Sauk. 



This brood covers a vast area from Wisconsin in the west to New 

 York in the east and along the Alleghany Mountains to North Carolina, 

 but the comparatively few localities on record are more widely scattered 

 and isolated from each other than in any other 17-year brood. It seems 

 more than probable that our knowledge of the extent of the brood is 

 very imperfect, so that nothing can be said at present regarding the 

 relation of this brood to other broods. Of the localities mentioned 

 above, Summit and Vinton counties, Ohio, as well as Ohio County. 

 West Virginia, are probably incorrect, the records being apparently 

 based upon stragglers of Brood XV (1880-1897), which appears always 

 one year before Brood XVII. The reported occurrence of the periodical 

 cicada along the northern slope of the Big Horn -Mountains of Montana 

 and Wyoming is probably based upon a confusion with some other 

 species of cicada. 



E. A. SCHWARZ, 



A smstant Entomologist. 

 Approved : 



James Wilson, 



, Secretary. 



Washington, D. C, April i, 1898. 



Note.— A knowledge of the exact extent of each swarm or brood of the cicada 

 is of considerable economic importance, and the object of this circular is to 

 invite the correspondents of the Division to send word regarding the appearance 

 of the cicada the present year so that previous records may be confirmed or 

 rejected, and new localities made known. 



o 



