30 Transactions of the Academy of Science of St. Louis 
J 
Mala 
in War Areas'' project who worked in an area approximately 
one mile from the limits of the Barracks. AA'ithout the assist- 
ance of these and many others the work would have been less 
complete. It is a pleasure to thank especially Dr. E. G. Mc- 
Gavran, St. Louis County Health Commissioner, for advice, and 
Mr. Kenneth J, Wulfert, Assistant Public Health Engineer of 
the County Health Department for a considerable part In the 
work. For identification of larval and adult mosquitoes of Mis- 
souri the most useful keys and descriptions are those of Car- 
penter (1941), though King, Bradley and McNeel (1942), 
Matheson (1929), and Tulloch (1939) have also been found 
useful. Doubtful identifications have been checked by Dr. J. A. 
Rowe and Mr. J. Fluno of the U. S. Public Health Service, 
whose kindnesses are gratefully acknowledged. 
Results 
1) Species Collected. A total of 981 collections have been 
examined. Of these 339 or 34.5 per cent were of larvae. In some 
cases larvae were bred through and the identifications checked 
with the adults. These collections comprised 15,lOO specimens 
distributed among 30 species and eight genera. The relative 
numerical importance of the species recorded is presented in 
Table 1. Of the species listed by Carpenter (1941) as common 
in Arkansas the following were not recorded during the present 
survey: Aedes atropalpus, Aedes canadensis, Aedes thihaulti, 
Aedes taeniorhynchus, Orthopodomyia signifera. However, the 
following species are new records for St. Louis County: Aedes 
dorsalis. Anopheles crucians, Orthopodomyia alba, PsoropUora 
cyanescens, Pso'rophora discolor, Psorophora howardii and Ura- 
no taenia sapphirina. 
From Table 1 it will be seen that Aedes vexans and Ctdex 
pipiens together make up 53.5 per cent of the total specimens 
examined. 
ph 
the most important vector of malaria in the United States. 
