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JOURNAL OF ECONOMIC ENTOMOLOGY 
[Vol. 13 
in ant-guards. It is necessary that the para-dichlorobenzene be used 
in powdered form and be well scattered in the guards. 
About two grams of powdered para-dichlorobenzene, or the same 
amount of camphor (either lump or powdered) was found very effect¬ 
ive in preventing the breeding of yellow fever mosquitoes in flower 
vases and similar receptacles. It should be repeated every fifteen days, 
or each time the water is changed. For holy-water urns, especially 
in churches, lump camphor is recommended. 
The use of these insecticides should be considered obligatory, and 
if, after due notice has been given, breeding is found, especially pupse, 
then the offender should be dealt with severely and to the full extent of 
the law, particularly so if yellow fever exists in the community. 
The central station of the sanitary corps should have these insecti¬ 
cides on hand and sell them to the public at, or nearly at cost. 
MOSQUITO CONTROL IN A SOUTHERN ARMY CAMP 
By S. M. Dohanian, Bureau of Entomology , Melrose Highlands, Mass. 
Early in the spring of 1918, the writer, then an enlisted man in the 
Signal Corps, U. S. A., was transferred to the Medical Corps at his 
request, and assigned to the problem of insect control at Kelley Field, 
the large aviation camp located about six miles southwest of the City 
of San Antonio, Texas. The most important feature of the insect 
problem was that of mosquito control and the prevention of the breed¬ 
ing of the house fly. This paper will be limited to that phase of the 
work dealing with mosquito control. 
As it would have been rather unwise to devote the entire efforts to 
removing breeding places in the camp proper and to pay no attention 
to the surrounding country where the insects might breed unmolested 
and fly to the camp, it was decided to cover a territory embracing the 
camp itself and a zone around the camp of about three miles, for unless 
conditions are especially favorable fresh water mosquitoes will not fly 
such a long distance. Exclusive of a portion of the City of San Anto¬ 
nio, which comes within this three mile zone, the population outside 
of the reservation is a little more than 450, with almost 80 per cent of 
them living in the small “ emergency ” town east of the camp, known as 
South San Antonio. The remainder live on scattered farms east and 
south of the reservation, while to the west there are practically no 
houses. 
The camp site was originally an immense cotton field, having a deep 
clay soil with only an occasional bed of sand or gravel protruding above 
this clay formation; and while it was almost uniformly level there 
were depressions of varying sizes which, owing to the nature of the 
