CHRONOLOGICAL ACCOUNT OF DIFFERENT BROODS. 41 
Brood XX. — Septendeeim—1883, 1900. 
In the year 1883, and at intervals of seventeen years thereafter, they will, in all prob- 
ability, appear in western New York, western Pennsylvania, and eastern Ohio. In the 
last mentioned State they occur more especially in Mahoning, Carroll, Trumbull, Co- 
lumbiana and adjacent counties, overlapping, especially in Columbiana County, some 
of the territory occupied by Brood XV. In Pennsylvania they OCCnpy nearly all the 
western counties, and their appearance is recorded in 1832, 1849, and 1866, by Dr. 
Fitch (his second brood), Dr. Smith, and several of my correspondents, the following 
counties being enumerated: Armstrong, Clarion, Jefferson, Chemung, Huntingdon, 
Cambria, Indiana, Butler, Mercer, and Beaver. 
1883. — This is one of the smaller broods which does not seem to have 
attracted much attention in 1883. Only two communications of a posi- 
tive character regarding its reappearance in that year have reached me, 
both of them from Pennsylvania. Mr. J. S. Elder, of Darlington, Beaver 
County, wrote me, June 7, 1883: k 'I heard the 17 year Cicada this morn- 
ing for the first; they were expected this year,' 7 and Dr. J. M. Toner 
also brought me, on June 16, 1883, specimens from Xew Derry, West- 
moreland County, stating at the same time that he had known them in 
1832, 1849, and 18G6 in the same locality. Some time in the earlier 
part of July, 1883, an item appeared in the Neiv York Herald stating 
that "a swarm of locusts" is doing much damage in Chautauqua County, 
Kew York. 1 wrote for further information to Mr. Xewel Cheney, of 
Poland Centre, of that county, but after careful inquiries he failed to 
confirm the statement. 
The appearance of the Cicadas in 186b' in northwestern Pennsylvania 
was verified by several correspondents, notably by Mr. J. C. Hamm, 
now of Humboldt, Kansas.* 
Brood XXI.— Seplendecim— 1884, 1901. 
In the year 1884, and at intervals of seventeen years thereafter, they will, in all proba- 
bility, appear in certain parts of North Carolina and central Virginia. In 1850 and 
1867 they appeared near Wilkesboro', N. C, and were also in central Virginia during 
the last mentioned year, while Dr. Smith mentions them as occurring in Monroe 
County and the adjacent territory in West Virginia in 1833 and 1830. 
Dr. Harris (Inj. Insects, p. 210) records their appearance at Martha's Vineyard, 
Massachusetts, in 1833, but as I cannot learn that they were there, either in 1850 or 
1867, I infer that Dr. Harris's informant was mistaken. 
1884. — In the year 1883 I received through the Smithsonian Institu- 
tion specimens from Loudonn County, Virginia, and these were doubt- 
* Whether the following letter, dated Angus! 2, 1883, which we received from Mr. 
O. C. Mortson, of Clendenin. Meagher County. Montana, refers to the Periodical 
Cicada or to another species of Cicada cannot be definitely determined, as 1 received no 
specimens. 1 simply quote it in order to draw attention to the possibility of a brood 
of the Periodical Cicada occurring in western Montana: '•The 17-year locust has 
made its appearance in large numbers on the south timbered slope of the Judith Basin. 
also near Missoula on the headwaters of the Columbia River. The insect 1 know to be 
a Cicada, as it is three-fourths of an inch long, with wings H to 1] inches long, with 
tissues forming a W- and when jumping past you sounds almost like a rattlesnake. 
They hatched out about July 13, and are still here." 
