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THE ARGENTINE ANT: DISTRIBUTION AND CONTROL. 23 
be the best and most economical fumigant for use in the trap boxes. 
Tt is hardly necessary to state that this method of control is not ap- 
plicable to city conditions, where dry nesting quarters are very 
plentiful and the ants do not colonize to any great extent. 
SUMMARY OF CONTROL MEASURES. 
ANT BARRIERS. 
In grossly infested houses much relief may be secured by isolating 
tables, refrigerators, safes, beds, etc., with bichlorid-of-mercury tape, 
or by placing the legs of articles of furniture in saucers filled with 
moth balls or coal oil. Trees, beehive stands, and other outdoor ob- 
jects may be isolated with the sticky substance used on fly paper but 
made thinner than usual. If 5 per cent of carbolized oil be added, 
the durability of the bands will be considerably increased. 
REPELLENT ANT POISONS. 
Repellents are much used to keep the ants from buildings. Strong 
antimony or arsenical sirups, a number of which are sold by drug- 
gists in infested territory, are used for this purpose. They give 
quick relief for short periods, but they are not a factor in the reduc- 
tion of the infestation. 
ATTRACTIVE ANT POISONS. 
The only effective poisons yet known for permanent control are 
poisoned sirups. The improved arsenical sirup recommended on 
page 18 will not spoil and is superior to any other formula yet tested 
on account of its stability at high temperatures, freedom from crys- 
tallization, and continued attractiveness. 
TRAPPING ANTS. 
Trapping ants may be accomplished in rural locations by provid- 
ing boxes of decaying vegetation in the winter. The colonies will 
move into these boxes and the ants may then be killed with carbon 
bisulphid. 
WASHINGTON : GOVERNMENT PRINTING OFFICE: 1916 
