42 THE SPRING GRAIN-APHIS OR 
of Kansas, also found the Hordeum pusillum much infested later in 
the season. In July there was an outbreak of Toxoptera on blue- 
grass (Poa pratensis) on the grounds of the United States Department 
of Agriculture, Washington, D. C. Later in the season the junior 
author found it on bluegrass in the fields about Richmond, Ind. 
In the fall of the same year (1907) this was the only plant on which 
the sexes and eggs could be found. In fact, for Indiana, Illinois, 
Ohio, and more northern localities bluegrass appears to be the normal 
host, and the " green bug" is readily found upon it at any time in 
the year even when it can be found only sparingly upon any other 
plant. 
A number of new host plants were added to the list in 1908. Mr. 
Kelly, of this Bureau, found Toxoptera feeding freely in the fields 
upon Hordeum jubatum and DistiMis spicata in Montana and upon a 
species of Andropogon in Colorado. Mr. Ainslie found it breeding 
freely in the fields upon Hordeum jubatum, H. csespitosum, H. nodosum, 
Elymus striatus, Agropyron tenerum, Bromus unioloides, B. porteri, 
Stipa viridula, and Polypogon monspeliensis about Artesia, N. Mex. 
In one instance Mr. Ainslie found several alfalfa plants (Medicago 
sativa) with colonies of Toxoptera upon them, as many as 21 speci- 
mens being observed on a single leaf. This seems very unusual and 
we have no other records of its occurrence on this plant. Prof. C. P. 
Gillette, of Fort Collins, Colo., found it infesting Agropyron occidentale, 
and in 1907 he found it feeding upon bluegrass. During the summer 
of 1908 Toxoptera was found by the junior author to breed freely 
upon Dactylis glomerata, Eleusine indica, Eragrostis pilosa, E. megas- 
tachya, Sporobolus neglectus, Agropyron repens, Elymus virginicus, 
E. canadensis, and Bromus secalinus, in his rearing cages at Rich- 
mond, Ind. 
In 1909 and 1910 a few more plants were added to the fist. Mr. 
Ainslie found it breeding freely upon Hordeum murinum in Arizona and 
upon Agropyron occidentale in New Mexico. Mr. Kelly found it 
breeding freely upon millet (Chsetocloa italica) and upon Japanese 
millet (Echinocliloa crus-galli) in Kansas. Mr. Harper Dean, jr., then 
of this bureau, found it feeding upon Stipa leucotricha in Texas. Mr. 
T. D. Urbahns, of this bureau, found that it bred readily in his cages 
at Dallas, Tex., upon Bermuda grass (Capriola dactylon), Chxtochloa 
viridis, Johnson grass (Sorghum lialepense), and upon rice (Oryza 
sativa). 
During the summer of 1909 Mr. T. H. Parks, of this bureau, and 
the junior author observed that Toxoptera bred freely upon Elymus 
striatus, Juncus tenuis, Poa compressa, Bromus commutatus, B. tec- 
torum (?), B. inermis, sheep's fescue (Festuca ovina), hard fescue 
{F. duriuscula), meadow fescue (F. elatior), various-leaved fescue 
