PSYCHE 
VOL. XLVI DECEMBER, 1939 No. 4 
A KEY TO THE MOSQUITOES OF MASSACHUSETTS 
By George S. Tulloch, Chief Entomologist 1 
Massachusetts Department of Public Health 
Boston, Massachusetts 
During the summer of 1939 the Department of Public 
Health of the State of Massachusetts conducted a state-wide 
mosquito survey with the cooperation of the Works Projects 
Administration. This survey was one phase in the program 
of a study of the general problem of encephalitis. It was 
initiated following an outbreak of encephalitis in man in 
1938 which was traced to the eastern virus of equine en- 
cephalomyelitis. The identification of biting mosquitoes was 
made by using a key compiled by Tulloch (1930) which was 
taken from Dyar (1922) and Matheson (1929) and modified 
to include those species reported from New England. The 
present key is a revision of the earlier one which has been 
enlarged to include the non-biting as well as the biting 
mosquitoes and is based on the examination of over 100,000 
specimens. Although this key is restricted to the species 
which may be found in Massachusetts it is sufficiently inclu- 
sive for use in any of the New England states. It is ac- 
companied by illustrations of many of the characters of 
taxonomic importance and by a summary of the species of 
Culicidse which have been taken in Massachusetts. 
i Grateful acknowledgment is made to the following for assistance: 
Dr. R. F. Feemster, Director, Division of Communicable Diseases, 
Massachusetts Department of Public Health; Dr. V. A. Getting, Tech- 
nical Director, Massachusetts Mosquito Survey; Prof. J. C. Bequaert, 
Consulting Entomologist; V. A. Bell, R. P. Holdsworth, Jr., C. E. Elliott, 
Dr. B. W. Parker, Dr. J. W. Hawkins, G. C. Tower, H. D. Rose, and 
R. O. Bohm, Entomologists and to Mr. J. Milano for preparation of 
the plates. 
