THE PERIODICAL CICADA IN 1911. 3 



Michigan. — Kalamazoo. 



New Jersey. — Entire State. 



Neiv York. — Albany, Columbia, Dutchess, Greene, Orange, Putnam, Rensselaer, 

 Rockland, Saratoga, Ulster, Washington, Westchester, and on Staten Island and Long 

 Island. 



North Carolina. — Bertie (?), Davie (?), Forsyth (?), Guilford, Orange, Rockingham, 

 Rowan, Stokes, Surry, Wake (?), Warren (?), Yadkin (?). 



Pennsylvania. — Berks, Bucks, Chester, Dauphin, Delaware, J>ancaster, Lebanon, 

 Lehigh, Montgomery, Northampton, Philadelphia, Pike, Potter, Schuylkill, 

 Wyoming. 



Virginia. — Albemarle, Alexandria, Amherst, Appomattox, Bedford, Buckingham, 

 Campbell, Caroline, Charlotte, Culpeper, Fairfax, Fauquier, Fluvanna, Goochland, 

 Hanover, Henrico, James City, Loudoun, Louisa, Lunenburg, Madison, Page, Pittsyl- 

 vania, Powhatan, Prince Edward, Rappahannock, Spottsylvania, Stafford. 



West Virginia.— BrookQ (?). 



13-YEAR BROOD XXIII. 



As already indicated, this is one of the largest of the 13-year broods, 

 dividing this honor with Brood XIX. Brood XXIII, appearing this 



Fig. 3 —Map showing distrilaitiou of 13-.vcar Brood XXIII, 1911. 



year, occupies the Mississippi Valle}' from northern Missouri and 

 southern Illinois to Louisiana, covering particularly the States bor- 

 dering on the Mississippi River. Its distribution is indicated on the 

 accompanying map (fig. 3) by black dots representing counties 

 merely, but the abundance of the distribution of the insect is indicated 



