INJURIOUS AND BENEFICIAL INSECTS OF CALIFORNIA. 381 



"The number of jars to use will depend upon the abundance of 

 ants. In the worst cases a half-dozen jars will serve for an ordinary 

 sized house and lot, and if the ants are not very bad one jar may be 

 enough. In such cases it is well to place it in the pantry or kitchen. " 273 



Newell and Barber have found that tape, wrapped many layers 

 thick, with corrosive sublimate between, around the legs of bee hive 

 stands and protected by a tight floor of the stand above and a metai 

 shield below, to prevent wetting, serve as an excellent ant barrier for 

 at least eleven months. The ditches used as barriers in the Southern 

 States are hardly applicable to most sections in California. Undoubt- 

 edly by far the most efficient means of control for all purposes is the 

 use of the slow-acting poison, as recommended above by Professor 

 Woodworth. The prepared poison is now on sale at the druggists in 

 1he infested areas and may be had at very little expense. 



~" 3 The Woodworth formula for the Argentine ant poison is as follows : Salsoda, 1 

 ounce; white arsenic, 1 ounce; sugar, 20 pounds, and enough water to make 3 gallons. 



