March, 1922.] Davis: Cicadas of Virginia. , 51 



the variety cassinii (Fisher), smaller than the typical form, and with 

 the lower surface of the abdomen usually much darker in color. 



Seventeen-Year Race. 



Brood I (1910-1927) ; fairly well distributed over the state, except 

 in the central portion. 



Brood II (1911-1928) ; recorded from a broad belt across the cen- 

 tral part of the state from north to south. On June 29, 191 1, Mr. 

 Wm. D. Appel and the writer observed colonies of this brood at Mt. 

 Vernon, Dyke, Arlington and Cherrydale. They were strictly in colo- 

 nies as stated. At Dyke we heard but five males singing on the hill 

 that we visited, and we quickly walked out of the area where the in- 

 sects had been numerous a few days before. The leaves had been 

 burned off of the ground some time in the late spring and showed 

 plainly many of the cones that had been erected by the pupae at an 

 earlier date, when the dead leaves lay as a mat in the woods. 



Brood V (1914-1931); recorded only from Augusta, Caroline, 

 Highland (?) and Shenandoah counties. 



Brood VI (1915-1932); recorded from Charlotte, Chesterfield, 

 Fairfax, Powhatan and Prince Edward counties. 



Brood IX (1918-1935) ; from the southern part of West Virginia 

 across Virginia into North Carolina. The following specimens of this 

 brood have been examined: Great Falls, May 23, 1918, female (E. A. 

 Chapin), and male of variety cassinii from same locality, May 28, 1918 

 (W. L. McAtee), both specimens in collection, U. S. Biological Survey. 



Brood X (1919-1936) ; particularly in the northeastern and south- 

 western portions of the state. 



Brood XIII (1922-1939) ; "a few individuals were reported from 

 two counties in Maryland in 1905, and two very doubtful records 

 (1888) have been found for Kentucky and Virginia." 



Brood XIV (1923-1940) ; reported from Alexandria, Augusta, 

 Buchanan, Dickerson, Fairfax, Frederick, Lee, Nelson, Tazewell and 

 Wise counties. 



Brood XVII (1909-1926) ; reported from Albemarle, Appomattox, 

 Prince William and Washington counties. 



Thirteen- Year Race. 



Brood XIX (1920-1933) ; reported from Brunswick, Halifax, Han- 

 over and Prince George counties. 



