EARLIEST OBSERVATIONS IN AMERICA. 
15 
On June 7, 1884, Mr. Albert Koebele found this species infesting 
wheat plants at Cabin John Bridge, situated in Maryland a few miles 
above Washington, and about July 1 of the same year the senior 
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Diagram I. — Maps of the United States east of the Rocky Mountains, showing normal temperature, upper 
line, and departure therefrom, lower line (+, above normal, and, — , below), for the critical period 
December, 1881, to May, 1882; above normal ( + ) in winter and below normal (— ) in spring being 
favorable for outbreak of spring grain-aphis. (Original.) 
author found it in one of his rearing cages, placed out of doors at 
Oxford, Ind. (see fig. 2). In the latter instance the species showed 
a preference for wheat plants over those of rye, and in September it 
