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CHRONOLOGICAL ACCOUNT OF DIFFERENT BROODS. yA 
the Prairie Farmer, briefly recording the appearance of Cicadas in Me- 
Lean County. 
Upon reviewing the localities of this brood as now ascertained we find 
that they represent a comparatively narrow curve with the ends point- 
ing northward. The northeastern extremity Commeuces in southeast- 
ern Massachusetts ; thence the line goes south to Long Island; thence 
west through Pennsylvania, southern Ohio, and northern Kentucky to 
southern Indiana; thence again bending northward and reaching cen- 
tral Iiinois with its northwestern extremity. “This large belt is, how- 
ever, by no means entirely occupied by the brood, and two large, com- 
pact central areas are plainly distinguished, one being in southeastern 
Pennsylvania, the other in northern Kentucky and southwestern Ohio. 
To the west there are two detached areas, one in southwestern Indiana, 
the other in central IHlinois, while to the east there are again two de- 
tached areas, one on Long Island and the other in southeastern Massa- 
chusetts. 
Broop IX—Septendecim (2?)—1s74, 1291. 
In the year 1874, and at intervals of seventeeen years thereafter, they will probably 
occur in southeastern Nebraska. 
The occurrence of this brood was communicated to me by Mr. Clarke Irvine, of 
Oregon, Holt County. The brood is most likely confined to the eastern or timbered 
portion of the State; and I judge it to be septendecim, from the fact that the latitude 
is rather more northerly than tredecim is known to oceur. 
1874.—Whether this brood is a 17-year or 13-year one still remains 
somewhat doubtful, with the probability in favor of the former; but 
its existence and, at the same time, its extent westward to Colorado 
seem to be contirmed by a letter from Mr. J. H. Rice, of Gold Hill, 
Boulder County, Colorado, dated July 31, 1874, stating that the Cica- 
das occurred there in 1874, but not very abundantly. While it is true 
that this locality in Colorado is widely detached from that in south- 
eastern Nebraska, yet we do not doubt that the Cicadas of both locali- 
ties belong to the same brood. In these less timbered western States 
the broods must naturally be very much broken up, and appear in scat- 
tered localities and not in compact regions, as in the timbered States. 
In this connection I would mention that on May 17, 1872, Mr. J. B. 
Miller informed me of a brood between the headwaters of the Smoke Hill 
River and Denver City, Colorado, in i858. ‘ Their work was plainly 
visible on a grove of young pitch pines.” If these Cicadas were not 
stragglers of this Brood IX, but belong to some other brood, they 
would be difficult to place among the broods here enumerated. If they 
are a 13-year brood they could only belong to our Brood VI, which is 
extremely improbable. Moreover, it is not likely that central Colo- 
rado possesses a 13-year brood. If they belong to the li-year race 
they would indicate a brood not yet enumerated and to be placed 
between my Broods IX and X. Although I have no reason to doubt 
the correctness of Mr. Miller’s statement, yet it must be remembered 
