Report on Mosquitoes Collected in St. Louis County During 1943' 29 
Introduction 
During the summer of 1942, a survey of the mosquitoes of 
St. Louis was carried 'on under the direction of the St. Louis 
County Health Department. The objects of the survey were to 
determine what mosquitoes were present in the County and 
where they were breeding with a view to developing the most 
efficient means of control of pest, and especially of disease- 
bearing species. 
At the outset of the survey the lack of any quantitative data 
on the relative numbers of various species of mosquitoes which 
had been recorded from the area rendered it difficult to recom- 
t 
mend control measures, and impossible to judge the efficiency of 
any program which was instituted. This report is an attempt to 
fill this need and should serve as a basis of comparison for future 
work That others have noted the paucity of data from Missouri 
is shown, igv example, by the remark of King and Bradley 
(1941, p. 72) 
Anoph 
that "an unexpectedly small number of records is to be found 
Missouri. Iowa, Kansas 
The mosquitoes of M 
from 
time to time in general works. Adams (1934) published an anno- 
tated list of 19 species which he had examined, and a more com- 
prehensive list including 41 species was jg^iven by Gordon (1940). 
References to the distribution of Anophelines were given by 
King and Bradley (1941). 
Organization of the Survey 
An 
assistance of Boy Scouts and the Health and Welfare Division 
of the Office of Civilian Defense. In addition, the following 
