15 
drift away to distant fields, they carry the parasite with them in their 
bodies. One of these parasitized winged females is shown in fig. 7. 
The very act of migration of the * green bug,” therefore, brings the 
parasite, and there is no need of artificial introduction, for if the 
center from which the * green 
bug ” is migrating has the para- 
sites, as it always does, the lat- 
ter are of necessity carried by 
their hosts and, furthermore, the 
adult parasites fly with the 
latter with favoring winds. 
During strong winds the 
Lysiphlebus does not use its 
wings, but crawls about over the 
plants and probably does not 
become scattered by gales. But pre. 7—Winged female of ther erecrbue npc 
in warm, comparatively stil] _ sitized by Lysiphiebus tritici. Enlarged (origi- 
weather the writer has observed ie 
both winged “green bugs” and parasites crawling abeut on the 
windows of railway coaches many miles away from seriously infested 
fields of grain. 
EXPERIMENTS IN DESTROYING “ GREEN BUGS” OVER SMALL AREAS. 
On leaving Washington both Mr. Ainshe and Mr. Phillips were 
instructed to place themselves in the position of a farmer whose grain 
fields were beginning to show the presence of the “* green bug” by 
small deadening spots, and to leave nothing undone or untried that 
would seem to afford relief and save the crop. 
Mr. Ainslie instituted some experiments in the use of a brush drag 
at Summers, Ark., and Mr. Phillips carried out similar experiments 
at Hobart, Okla., but in neither case was the measure sufficiently 
effective to warrant its recommendation. Experiments in rolling 
infested fields with heavy farm rollers were conducted by both of 
these agents, but it was invariably found that this measure was only 
effective on smooth lands. When the seeding is done with a grain 
drill, as most of it is, the plants grow up in the bottoms of shght 
furrows, and the roller comes in contact with the ridges only, leaving 
the young plants and their inhabitants almost wholly untouched. 
This measure, also, is therefore of little practical value. 
Mr. Ainslie tried dusting with lime and also with sulphur, but 
both substances were ineffective. 
Both Mr. Ainshe and Mr. Phillips carried out a series of careful 
[Cir. 93] 
