THE MOSQUITOES OF THE UNITED STATES. 
By Harrison G. Dyar, 
Custodian of Lepidoptera, United States National Museum. 
INTRODUCTION. 
Mosquitoes are small two-winged flies belonging to the order of 
Diptera, family Culicidae, subfamily Culicinae. The species are 
distributed all over the world, from the Arctic regions to the Tropics, 
but different species and genera are concerned in different faunal 
regions. The United States as here considered embraces the region 
between the Canadian and Mexican boundaries, including southern 
Florida and Alaska. This territory includes three main faunal re- 
gions. The first and most northern (except Alaska) is the Canadian 
zone. ‘The mosquitoes of this region were treated in a separate paper 
by the writer.t | This paper includes all mosquitoes reported from 
Canada, and not only those belonging to the Canadian zone proper. 
However, this paper will be more useful for the parts of the United 
States where the Canadian species are dominant than the present 
one, and the reader is accordingly recommended to it. The parts 
of the United States referred to are, roughly, northern Maine, the 
mountains of New England and New York, northern Minnesota, 
the mountains of Montana, and the higher parts of the Rocky Moun- 
tain chain to Colorado and the Yukon Valley in Alaska, above the 
southward bend of the river. The mountains bordering the Pacific 
coast, the Cascades and Sierra Nevada, have the Canadian fauna 
considerably modified, and are not covered by the paper referred to. 
They will be found included here. 
The second faunal region comprises the coastal area on the Pacific 
between the mountains and the sea, beginning in Washington State 
and extending up the coast at least to Cape Fanshaw, Alaska. Above 
the area where the coast is bordered by islands, two more regions 
are indicated, but the country is insufficiently explored to permit of 
positive conclusions. 
1Dyar, H. G., The Mosquitoes of Canada, Transactions of the Royal Canadian Institute, 
vol. 13, pp. 71-120, 1921. 
No. 2447—PrRoceEEDINGS U. S. NATIONAL MUSEuM, VOL. 62, ART. I. 
60466—23—Proc. N.M.vol.62——1 1 
