468 JOURNAL OF ECONOMIC ENTOMOLOGY [Vol. 9 



Explanation of Plates 34, 35 



Fig. 2. Chrysanthemum leaf showing newly formed galls of the chrysanthemum 

 gall-fly on the under surface. Enlarged. (Original. Photo Vjy Dept. Sci. Illust., U.C). 



Fig. 3. Stem of chrysanthemum showing the galls made by the chrysanthemum 

 gall-fly. The round holes were made by parasites. Enlarged. (Original. Photo 

 by Dept. Sci. Illust., U. C). 



Fig. 4. Tip of young chrysanthemum plant showing fully-developed galls of the 

 chrysanthemum gall-fly. The galls were dark red and mostly on the upper sur- 

 faces of the leaver. (Original. Photo by Dept. Sci. Illust., U. C). 



Fig. 5. Young shoot of chrysanthemum plant showing the deformity due to the 

 galls made by the chrysanthemum gall-fly. This is a fair example of the work in 

 greenhouses and lath houses when control measures are not employed. Enlarged. 

 (Original. Photo by Dept. Sci. Illust., U. C). 



Chairman H. J. Quale: The next paper by Mr. E. Ralph de Ong 

 on the Municipal Control of the Argentine Ant will be read bj^ the 

 secretary. 



MUNICIPAL CONTROL OF THE ARGENTINE ANT 



By E. Ralph de Ong, Instructor in Entomology, Univerdly of California 



The Argentine Ant was first recognized in California about 1908, 

 at only eight points in the state but has since spread to most of the 

 larger cities on the coast. The list of known infested towns in 1916 

 being as follows; San Diego, Corona, Riverside, Upland, Claremont, 

 Azusa, Monrovia, Los Angeles, Montecito, Santa Barbara, Santa 

 Maria, Salinas, San Jose, Cupertino, Saratoga, Redwood City, San 

 Mateo, Burlingame, San Francisco, Alameda, Berkeley, Oakland, 

 Piedmont, Stege, Martinez, Byron Hot Springs, Stockton, Sacra- 

 mento, and St. Helena. In many of these towns the infested area is 

 comparatively small but steadily increasing while in others, for instance 

 Alameda, practically the entire town is infested. 



Here is an example of a most annoying house pest spreading in a 

 few years' time in scattering colonies over a strip of territory, 700 

 miles long, without any systematic effort being made to check its 

 invasion. Carried from city to city by commerce they gain a foot- 

 hold and slowly but surely spread out on every side in spite of the 

 thousands of dollars spent by the householders and the hosts of ant 

 remedies for sale; even a list of which is too cumbersome for this paper. 

 Thirty-nine arsenical ant remedies have been recorded in this state 

 alone, the percentage of metallic arsenic ranging from 12 per cent 

 to .2 per cent. The great majority of these are strong percentages of 

 arsenic which are not effective in control work on this ant and are 

 unsafe to have on the premises, especially where there are children. 



