19 



Specimens of this species were first discovered in small numbers in 

 June, 1884, on wheat at Cabin John Bridge, Md., while during the same 

 month, after harvesting of the wheat, it was found by me to be quite 

 plentiful on rye and oat near Washington, D. C, and among them 

 many of the winged insects, mainly stationed on the petioles and green 

 seed capsules, which had become more or less discolored on that 

 account. Whereas the majority of larvae were found on the under 

 side of the leaves, none were observed on the stems or roots. At the 

 same time and in the same field they were also found infesting the ears 

 and leaves of Agrostis vulgaris, Bromus secalinus, and Dactylis glo- 

 merata growing between or near the grain. During September of 1884 

 migratory females found on wheat were received from Oxford, Ind. 

 As an illustration of how far certain species of aphides may be dis- 

 tributed by currents of air, it may be worth while to mention the 

 fact that a number of migrants of this species were dipped up from 

 the surface of the Alantic Ocean 9-1 statute miles from the nearest 

 land, in the neighborhood of Nova Scotia, July 3, 1887, by the Fish 

 Commission steamer Grampus. During November of the same year 

 the species was found breeding on oat at Washington, D. C. In May, 

 1889, it was found on oat at Paxton and on wheat at Pleasantville, Ind. , 

 while at the same time it was reported as being very plentiful on wheat 

 at Shiloh Hill, 111. During June of the same year it was reported as 

 being very abundant on wheat and oat at Glendale and Columbus, 

 Ohio, and Vincennes, Ind., and from Selkirk, Mich., on wheat and 

 rye, at which time it was also found to be very abundant on oat at 

 Highlands, N. C. In August it was found on oat at Ottawa, Canada, 

 and in October on clover growing among the dry stubble of wheat at 

 Washington, D. C. In Januar} 7 , 1890, specimens were discovered on 

 wheat in Indiana and at Liberty, Va., covering the plants and killing- 

 large numbers of them. In May of the same } T ear they were found 

 on rye at Landisburg, Pa., while from Trenton, Morristown, and 

 Camden, N. J. , the report came that they covered the wheat and rye 

 and were doing much damage. During June of 1890 the}" were 

 reported from Storrs, Conn., Lunenburg, Pa., New Harmony, Ind., 

 Milton, Ky., and Larue, Ark., as ruining the wheat and oat crop. 

 In June and July of 1891 the species was observed on -wheat at 

 Millville and McGregor, Iowa, and Nashville, Tenn. The species 

 was also found in Ma} T of 1892 on wheat at Columbus, Ohio; in 

 November on Setaria viridis at Washington, D. C. ; in June and July 

 of 1894 on timothy and wild rye in Virginia, opposite Washington, 

 and in September on the ears of oat at Shelton, Mont. Lastly, they 

 were reported as doing much damage to the ears of wheat from 

 Brookings, S. Dak., since which time nothing has been heard of the 

 species from any locality. 



The food plants on which, thus far, it has been observed in this 

 country are: 



