34 THE PERIODICAL CICADA. 
Since the publication of the above I have received the following inter- 
esting communications regarding this brood : Mr. J. H. Niles, of Havana, 
Huron County, Ohio (letter of June 7, 1877), writing about the distri- 
bution of Broods XV and XXII, says : " I am acquainted with two dis- 
tinct families of the Cicada in northern Ohio. I first saw the great 
eastern Ohio family [XV], due in 1880, in 1846, and again in 1863; and 
the small family [XXII], due in 1885, in 1834, again in 1851, and agaiu 
in 1868. When the Ci°ada appeared in 1846, the question was raised 
whether they were partial to any particular geological formation. The 
result showed that they occupied the conglomerate, the sandstone, and 
the slatestone formations of eastern Ohio, not the limestone forma- 
tion of western Ohio. For instance, a line drawn for the western edge 
of the black slate, from the city of Bucyrus, in Crawford County, and 
the northwest corner of Huron County and Erie County, to the east of 
Sandusky Bay, marked correctly the western edge of the Cicada of 
1880."* 
An important contribution to our knowledge of the extent of this 
brood was furnished by the following letter from Mr. Luther Haymond, 
of Clarksburg,' Harrison County, West Virginia, dated June 1, 1877: 
" The Seventeen-year Cicada appeared in this district as follows: On 
the 12th May, 1795 ; on the 25th May, 1812 ; on the 25th May, 1829 ; on 
the 15th May, 1816; on the 25th May, 1863. lam not certain as to the 
extent of this Cicada district, but I think it includes all of West Vir- 
ginia lying on the west side of the Alleghany Mountains." 
1880. — The reappearance of this brood in Pennsylvania and Ohio was 
generally noted in the papers, without, however, conveying any new or 
important information. The New Yorlc Weekly Tribune of June 7, 1880, 
contains an article commencing, " The seventeen-year locust is filling 
the hills and rich bottom lands of western Pennsylvania and Virginia 
with its droning thunder," &c. Since this brood has never been ob- 
served east of the Alleghauies, its occurrence in Virginia is extremely 
improbable, and the author of the article apparently intended to write 
" W r est Virginia." Several of my own correspondents reported the brood 
from Geauga and Lake Counties, Ohio, and Mr. William H. Edwards, 
of Coalburg, W. Va., wrote that the Cicada had appeared in his section 
of West Virginia (Amer. Entom., Ill, p. 170), thus confirming Mr. Hay- 
mond's statement given above. 
Thus the brood, so far as now ascertained, occupies a very compact 
area, comprising western Pennsylvania, western West Virginia, the 
whole eastern half of Ohio, and adjacent portions of northern Ken- 
tucky. 
There do not seem to be any well-established detached localities for 
this brood, and the only indication of any such locality is contained in 
the article by Professor Bessey referred to under Brood XIII (Amer. 
* The continuation of this letter, relating to Brood XXII, will be found under. that 
brood. 
