THE AMERICAN ENTOMOLOGIST. 



71 



Mr. L. ^Y. Lyon, at the July (18(58) mooting of 

 the Alton (Ills.) Horticultural Society, ovon 

 nientionod its appearance in ISOf!. 



In Illinois it occurs more or less throug-hout 

 the whole southern half of the State, but more 

 especially occupies the counties from the south 

 part of Adams county along the Mississippi to 

 the Ohio, up the Ohio and "Wabash rivers to 

 Edgar county, and then across the center of the 

 State, leaving some of the central counties in 

 soutli Illinois unoccupied. To be more explicit, 

 we enumerate all the counties in wliich it un- 

 doubtedly occurred during the present year 

 (18G8): Adams (south part, back of Quincy), 

 Clinton (northwest corner, adjacent to Madison), 

 Champaign, Coles, Crawford, Cumberland, Clay, 

 Clark, Edwards, Edgar* (especially in the east- 

 ern part), Franklin, Gallatin, Hardin. Hamilton, 

 Johnson, Jaspei'. Jersey, Jott'erson, Lawrence, 

 McLean (east end), Macon, Madison, Marion, 

 Ma.ssac, Pike, Perry, Piatt, Pope, Richland, 

 Sangamon, Saline, St. Clair, Union (northeast 

 corner), Washington, Wayne, Wabash, "William- 

 son, and White. There were none the present 

 year, either at Decatur in Macon county, at Cen- 

 tralia in Marion county, or at Pana in Christian 

 county ; nor were there any at Bloomington or 

 Normal, in McLean ; nor in Dewitt county, 

 which lies soutli of McLean ; nor in Spring Creek, 

 Iroquois county, whicli is northeast of Cham- 



the whole State, with the exception of the north- 

 west part, extending east to Grand river and 

 south to a little below the Missouri river. We 

 enumerate those counties in which we have un- 

 doubted evidence of their appearance during the 

 present yef?r (1808) viz.: Audrain, Bollinger, 

 Benton, Clark, Chariton, Callaway, Cooper, 

 Cole, Franklin, Gasconade, Iron, Jefferson, 

 Knox, Lewis, Marion, Macon, Morgan, Moni- 

 teau, Pike, Phelps, Pulaski, Polk, Pettis, Schuy- 

 ler, St. Chai-les, St. Louis, St. Francois, St. 

 Clair, Warren, and Washington. 



It is not improbable that this brood overlaps 

 some of the territory occupied by the septem- 

 decim Brood X. Whether it extends into Kan- 

 sas or not, we have not ascertained 4 but, east of 

 the Mississippi, it occupies more or less terri- 

 tory in the States of Kentucky, Tennessee, Mis- 

 sissippi, Alabama and Georgia; while, west of 

 that river, it occurs in Louisiana, Arkansas, and 

 Indian Territory. In the country west of the 

 Mississippi, and in Louisiana, Tennesseet, Mis- 



• Edgar county also has our septemdccim Brood III. 



t Though they occurred in large numbers in Davidson 

 county and other portions of Tennessee in 1855, and also the 

 present year, yet in Lawrence county they appeared in 1856, 

 instead of 1855^auother instance of a belated lirood . 



sissippi, Alabama, and Kentucky, we have good 

 evidence of the iredecim character of the brood 

 which has appeared in those States the present 

 year, while we have nothing to prove that a 

 septemdecim brood ever occurs in those States. 

 But it is quite different in Ohio, Indiana, and 

 Georgia. In Ohio alone they have no less than 

 SIX undoubted broods of septemdecim, namely, 

 our Broods YI. IX, X, XI, XIV, and XVI; 

 w^hile, as we shall show in Brood XVI there 

 is no evidence of a iredecim brood there. 

 So iu Indiana there is no evidence of a 

 iredecim brood, though one man '^e discov- 

 ered in future. In Georgia, on the other hand, 

 they in all probability have both our tredecim 

 Brood XIII, and our septemdecim Brood XVI; 

 for, while Fitch records their appearance 

 there in 1851, the correspondent to the Depart- 

 ment of Agriculture from Atlanta, in the 

 monthly report for July, 1868, says of their ap- 

 pearance there the present year: "The 13-year 

 locust appeared in May, and disappeared the 

 first week in June.'' 



BROOD XW .—Septemdecim— \xru lS8:i. 



Ill the year 1883, and at intervals of 17 years 

 tlicrcafter, they will, in all probability, appear 

 in western New York, western Pennsylvania, 

 and eastern Oliio. 



This is the 2nd brood of Dr. Fitch, and has 

 been recorded in 1832, 1849, and 18(50; and wo 

 have ourselves many records of its appearance 

 iu 18G6. In some partsof New York there must 

 have been precursors to this, as there have been 

 to other broods, forT. T. Southwick, of Manlius, 

 Livingston county, in western New York, re- 

 cords their appearance there in 180.5; while they 

 appeared during the same year near Cayuga 

 Lake, New York, as will be seen by referring to 

 the Prairie Farmer, vol. 10, p. 2. 



BUOOD W .—Septemdecim— \im , 1SS4 



In the year 1884, and at intervals of 17 years 

 thereafter, they will in all probability appear in 

 certain parts of North Carolina and Central Vil-- 

 ginia. In 18.50 and 1867 they appeared near 

 Wilkesboro, N. C, and were also in Central 

 Virginia' during the last mentioned year. 



Dr. Harris (Inj. Insects, p. 210) records their 

 appearance at Martha's Vineyard, Massachusetts, 

 in 1833. AVe have made some inquiry, but have 

 not yet learned that they were there either in 

 18.50 or in 1867. Hence we should rather infer 

 that Dr. Harris's infVirmant must have been 

 mistaken. 



BROOD XVI.— Sf^j/emdec-im— ISGS, 188j. 



In the year 1885, and at intervals of 17 years 

 thereaftei-, they Avillin all probability appear on 



