32 FOURTH ANNUAL REPORT OF 



BROOD lY . — Tredccim—lS^l , 1870. 

 In the year 1870, being the same as the preceding, they will, in all probability, appear in Jack- 

 son, Gadsden and Washington counties, Florida, having appeared there, according to Dr. Smith, ia 

 1844 and '57. 



The appearance has been fully confirmed, and as the following commu- 

 nication will show, the Brood extends even into Alabama, Mississippi and 

 Tennessee. 



Dear Sir — The IS-j^^ar Brood of the Periodical Cicada mentioned in 

 your first Missouri Eejiort (your Brood IV) appeared, according to predic- 

 tion, in northwestern Florida this year, extending northward over Alabama 

 and a good portion of eastern Mississippi, and into Tennessee as high as 

 this point. I think I wrote you when they were here. They were not in 

 great numbers at any point. I was at Mobile at the time of their appear- 

 ranee there, and found them singing quite merrily in the woods below the- 

 city. J. Parish Stelle. 



Savannah, Tenn., Sept. 2, 1870. 



brood V .—Septemdecim^l85i, 1871. 



In the year 1871, and at intervals of seventeen years thereafter, they will, in all probability, 

 appear around the liead of Lake Michigan, extending as far east as the middle of the State of Mich- 

 igan, and west an unknown distance into Iowa. Also in Walworth cou]ity and other portions of 

 Southern Wisconsin, and southward into Illinois. This brood is equal to Dr. Fitch's Sixth. It 

 extends all over Xovthern Illinois, and as far south as Edgar county, and its appearance in 1837 and 

 1854 is well and thoroughly recorded. In Champaign county, 111., it overlaps Brood XVIII, or the 

 Southern Illinois iredecim brood, wliile it also interlocks with Brood XIII (septcmdecim) in the same 

 county. 



They will also appear in the same years in the southeast by eastern part of Lancaster county, Pa. ,. 

 in what is called the ' ' Pequea Vallej', ' ' having appeared there in vast numbers in 1854. 



The earliest known record we have of the appearance of periodical Cicadas, is in Morton's 

 "^Memorial," in which it is stated that they appeared at Plymouth, Plymouth county, Mas.s. , in the 

 year 1633. Now, according to that date, one might be led to suppose that this recorded brood of Mor- 

 ton's belonged to this Brood V, as exactly fourteen) periods of seventeen years will have elapsed 

 between 1633 and 1871; but, strange to saj^, we have no other records of tliis brood than that in the 

 "Memorial," whereas there are abundant records of their appearing one year later in the same 

 locality, ever since 1787. There is, therefore, good reason to believe that the visit recorded by Mor- 

 ton was a premature one, and that it was properly due in 1634. I have therefore placed it in Brood. 

 VIII, and have little doubt but that if records could be found, these would prove the Cicadas to have 

 appeared in 1651, 1668, 168.5, 1702, 1719, 1736, 1753, and 1770, as they did in 1787, 1804, 1821, 1838, and 

 1855. 



Throughout the country mentioned in the first paragraph, the woods,. 

 orchards, cornfields and even meadows were vocal with the shrill song of 

 these seventeen-year visitors. I was absent during the time of their appear- 

 ance, but through the kindness of Dr. LeBaron, Mr. Suel Foster, of Mus- 

 catine, Iowa, Mr. H. H. McAfee of the Wisconsin University, and several 

 other corresjDondents, I am enabled to fix more precisely the northern, 

 southern and western boundaries of this Brood. Thus, in Wisconsin we 

 may draw a line from Milwaukee on the east, gradually southward to the 

 middle of the southern line of Waukesha county, then making a sudden dip 

 to the centre of Walworth county, and rising again a little above the south- 

 ern line of Jeff'erson county ; then falling a little below Dane ; then rising 

 from the S. W. corner of Dane to the jST. W. corner of Iowa county, and 

 from thence along the AVisconsin river to its mouth. There seems also to- 

 be a detached branch commencing about the middle of the northern part of 

 Iowa county and running across the Wisconsin river into Sauk coimty. In 

 Iowa the boundary line extends from the mouth of the Wisconsin river. 



