Arar THE PERIODICAL CICADA, 
over at least a portion of its range. The Iowa distribution of the 
brood was carefully studied by Professor Bessey in 1878. 
The range of the brood as given below is based on the published 
records, together with a number of additional localities collected from 
the correspondence of the Bureau. 
The distribution, by States and counties, is as follows: 
InuiNors.—Champaign, Fulton, Hancock, McDonough, Mason, Warren. 
Towa.— Adair, Adams, Audubon, Boone, Cass, Dallas, Davis, Decatur, Des Moines, 
Greene, Hamilton, Henry, Iowa, Jasper, Jefferson, Johnson, Keokuk, Louisa, Mad- 
ison, Mahaska, Marion, Marshall, Monroe, Muscatine, Polk, Poweshiek, Ringgold, 
Scott, Story, Taylor, Union, Van Buren, Wapello, Warren, Wayne, Webster. 
et 
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Fic. 7.—Map showing distribution of Brood IV, 1913. 
Missourt.—Bates, Buchanan, Clark (?), Grundy, Henry, Johnson, Knox (?), 
Lewis (?), Macon (?), Marion (?), Monroe (?), Putnam, Ralls (?), Randolph (?), Schuy- 
ler (?), Scotland (?), Shelby. 
NEBRASKA.—Johnson. 
Oxnto.—Champaign. 
West Virainta.—Mononegalia. 
Broop I1V—Septendecim—1913. (Fig. 7.) 
This brood, described by Walsh-Riley as Brood X (Riley XIV) 
succeeds Brood III by one year, and in the main appears to be a 
southwestern extension of the latter, covering a portion of south- 
western Iowa, eastern Kansas, and Indian Territory, with detached 
localities in Missouri and other States. Its original connection with 
