72 Annals Entomological Society of America [Vol.11, 



other species of Aphid s on these grains. The insect also has 

 been found breeding upon a considerable number of native grasses 

 any one of which may constitute its alternating food plant, upon 

 which it may survive the summer in different portions of the 

 United States. It has been found breeding freely upon Alope- 

 curns geniculatus in Oklahoma by Mr. W. J. Phillips and by Mr. 

 C. N. Ainslie in Kansas; on Agropyron occidentalis, also in Okla- 

 homa, by Mr. Phillips; and by Mr. O. E. G. Kelly and Professor 

 Gillette in Colorado. Agropyron tenenun was found moderately 

 infested by Mr. C. N. Ainslie at Las Vegas, New Mexico. It was 

 found breeding upon Bromus at Washington, D. C, and also 

 upon Bromus portcri at Las Vegas, New Mexico, and on an un- 

 determined species of Bromus at Mesilla Park, New Mexico, also 

 by Mr. Ainslie. I observed it very abundantly on Dactylis glom- 

 erata in Indiana in 1890, and again excessively abundant in a 

 small, isolated meadow, of this grass near Midlothian, Virginia, 

 in April, 1907. This meadow was located in a region not adapted 

 to the growing of grain and there was no field of growing wheat 

 or oats w^ithin five miles. Mr. Kelly found it inhabitating Dis- 

 tichlis spicata in such abundance as to be damaging this grass in 

 Montana, which in that part of the country is known commonly 

 as "salt grass." It was found inhabiting Elymiis striatus at Las 

 Vegas, New Mexico by Mr. C. N. Ainslie. Mr. W. J. Phillips 

 found it attacking Hordemn pusilhim at Beloit, Kansas, and. 

 Kingfisher, Oklahoma, while I found this to be of frequent occur- 

 rence throughout Kansas. Mr. Kelly observed it abundant on 

 Hordeum jubatum in Montana, while Mr. C. N. Ainslie found it 

 moderately abundant on Hordeum ccespitosum near Cimarron, 

 New Mexico. Wherever Poa pratensis grows the insect will prob- 

 ably be found breeding upon it through the entire summer. In 

 fact this has been actually observed to occur in the city of 

 Washington. Mr. Phillips has also observed it in Indiana and 

 throughout the northern sections of the country, where Toxoptera 

 occurs ; it is more likely to be found on this plant during summer 

 than upon grain, excepting, perhaps, during seasons of excessive 

 abundance. Mr. C. N. Ainslie also found it moderately abundant 

 on Polypogon monspeliensis about Albuquerque, New Mexico. 

 It has been found breeding on Stipa viridida at Las Vegas, New 

 Mexico, by Mr. C. N. Ainslie, the grass being heavily infested. 

 As one or more of these grasses will be found to occur in almost 

 every portion of the United States, it would appear that the non- 



