20 THE PERIODICAL CICADA. 
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 yon when they 
were here. They were not in great numbers at any point. I was at Mobile at the 
time of their appearance there, and found them singing quite merrily in the woods 
below the city. 
J. PARISH STELLE. 
SAVANNAH, TENN., September 2, 1870. 
1883.—I received no reports for this year, but, if Mr. Stelle’s word 
is to be depended on, there cannot be much doubt that this brood is 
well established, though it may not appear in great numbers at any 
place. 
Broop V.—Seplendecim—1871, 1888. 
In the year 1871, and at intervals of seventeen years thereafter, they will, in all 
probability, appear around the head of Lake Michigan, extending as far east as the 
middle of the State of Michigan and west an unknown distance into lowa. Also in 
Walworth County and other portions of southern Wisconsin, and southward into 
Illinois. This brood is equal to Dr. Fitch’s sixth. It extends all over northern Ili- 
noisand as far south as Edgar County, and its appearance in 1337 and 1854 is well and 
thoroughly recorded. In Champaign County, Illinois, it overlaps Brood XVIII, or 
the southern Illinois tredecim brood, while it also interlocks with Brood XIII (septen- 
decim) in the same county. 3 
They will also appear in the same years in the southeast by eastern part of Lan- 
caster County, Pennsylvania, in what is called the ‘‘ Pequea Valley,” 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 appeareé at Plymouth, Ply- 
mouth County, Massachusetts, in the year 1633. Now, according to that date, one 
might be led to suppose that this recorded brood of Morton’s belonged to this Brood 
V, as exactly fourteen periods of seventeen years will have elapsed between 1633 and 
1871; but, strange to say, we have no other records of his 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 Morton 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, 1662, 
16%5, 1702, 1719, 1736, 1753, and 1770, as they did in 1787, 1804, 1821, 1838, and 1855. 
1871.—Throughout the country mentioned in the first paragraph, the 
woods, orchards, corn-fields, and even meadows were vocal with the 
shrill song of these 17-year visitors. I was absent during the time of 
their appearance, but through the kindness of Dr. LeBaron, Mr. Suel 
Foster, of Muscatine, Iowa, Mr. H. H. McAfee, of the Wisconsin Uni_ 
versity, and several other correspondents, [ 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 center of Walworth County, 
and rising again a little above the southern line of Jefferson County ; 
then falling a little below Dane; then rising from the southwest corner 
of Dane to the northwest corner of lowa County, and from thence along 
