CONTROL OF ARGENTINE ANT IN CALIFORNIA. 5 
tribution was made by Prof. C. W. Woodworch, of the University of 
California. It was then reported as widely distributed about the San 
Francisco Bay region and in Southern California at Azusa and Upland. 
By 1910 the total territory involved was estimated at 4,000 acres in 
northern California and 1,000 acres in the southern part of the State. 
During the 10 years intervening between the second survey of Prof. 
Woodworth and to-day this ant has greatly extended its area of 
occupation, spreading into the great interior valleys of northern 
California, and including within its limits localities in every county 
in the south excepting one, as follows: Los Angeles, 39; San Bernar- 
dino, 8; Riverside, 4; Ventura, 5; Santa Barbara, 5; Orange, 10; 
\ !SAN BERNARDINO 
V E N'TURA\ LOS ANOtLEs' 
- \ • . i 
••,- •$£/? "^ 
To, v) # 
• ^.\ • 
•£V R IVERSIDE 
ITA CATALlNA^^-x 
ISLAND )^v 
I 
Fig. 2.— Present known distribution of the Argentine ant in Southern California. 
San Diego, 6. Two heavy infestations have been observed on 
Catalina Island, off the mainland of Los Angeles County. (See fig. 
2.) The infested territory appears to fall for the most part within 
cities and towns, although the country acreage concerned is very 
large, between 8,000 and 10,000 infested acres being known in citrus 
alone. 
Elsewhere in the United States the Argentine ant has been reported 
to occur in settled localities throughout the Southern States, being 
established as far north as Nashville, Tenn., and Raleigh, N. C. 
First described from Argentina it has since gained a foothold in other 
parts of South America, in the Madeira Islands, South Africa, and 
Germany. 
