24 PAPERS ON CEREAL AND FORAGE INSECTS. 
and in parts of Thnois. Prof: T. D. A. Cockerell found a few speci- 
mens of both the long-winged and the short-winged forms at Mesilla 
Park, N. Mex.; Messrs. E. A. Schwarz and H. S. Barber, of this 
bureau, found a few short-winged forms at Hot Springs, Yavapai 
County, Ariz.; Mr. George I. Reeves found some long-winged forms 
in southwestern Washington; and Mr. Albert Koebele and Dr. P. R. 
Uhler found a few at San Francisco and Alameda, Cal., and also in 
Lower California. Prof. Herbert Osborn found the short-winged form 
at Sault Ste. Marie, Mich., and Mr. Herbert T. Osborn found it at 
Wellington, Kans. 
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G= WESTERN & SOUTHERN LIMIT OF DESTRUCTIVE OUTBREAKS. @=LOCALITIES WHERE CHINCH BUGS HAVE 
@SEAREA OF GREATEST INFESTATION DURING 1909 anp 19/0. BEEN FOUND OUTSIDE OF AREA OF SERIOUS 
INFESTATION. 
Fic. 11.—Map showing distribution of the chinch bug west of the Mississippi River, 1911. (Original.) 
DESCRIPTION AND NUMBER OF GENERATIONS. 
Full descriptions of this insect are found in Bulletin No. 69 and in 
Circular No. 113 of this bureau and will not be repeated here. 
There are two principal generations annually in the Middle West; 
the spring generation and the fall, or hibernating, generation, and a 
partial third generation sometimes occurs in late fall to the south- 
ward. 
MIGRATIONS. 
The hibernating bugs (fig. 14) issue from their winter quarters as 
soon as the sun warms up the grasses in the spring, and fly out to 
green grasses and young wheat “anid barley, where they feed, mate, 
and deposit their eggs. The eggs (fig. 13 a, b) begin to hatch in late 
April and continue hatching until June, varying with the seasonal tem- 
perature and the latitude of the locality affected. The young bugs 
