More About Mosquitoes
Nature Bulletin No. 20 June 23, 1945
Forest Preserve District of Cook County
Clayton F. Smith, President
Roberts Mann, Superintendent of Conservation
MORE ABOUT MOSQUITOES
Twenty-two species of mosquitoes are found in large numbers in Cook
County. One species lays its eggs in water collected in hollow trees and
logs. The other twenty-one species are classified in four groups
according to their breeding habits.
There are five species of the "woodland" group. These lay their eggs in
little depressions in the woods, to be hatched after the warm rains in
April or May of the following spring. They are all large, showy
mosquitoes but have a short flight range.
The "marsh" mosquitoes, of which we have six species, lay their eggs in
the bottomlands and temporary swamps. These may fly as far as fifteen
miles from their breeding places.
The third group breeds in permanent lakes, ponds and marshes, and also
in polluted streams. They have also a long flight range. We have six
species of these most common, including two species of the Anopheles
which transmit malaria, and two species which do not bite humans. The
females of the "nonbiters" get their required blood by biting the heads
of birds .
we have four common species of "domestic" mosquitoes which
hibernate over the winter in basements and such protected places,
sallying forth in the spring to lay their eggs in every conceivable place
where water collects. Their principal breeding places are in polluted
waters, but they also breed in old tin cans, clogged roof gutters, bird
baths, cisterns, catch basins and basement floor drains. Weeds,
shrubbery and tall grass do not breed mosquitoes, but they do harbor
them during the heat of the day.
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Update: June 2012