e do not differ very much from the pupae of other species although
the breathing-tubes on the thorax are usually shorter and the creature
usually rests with its abdomen closer to the surface, that is, it does
not hang down from the surface quite as straight as do other forms (Fig.
85).

The adults may be found out of doors or in houses, barns or other
outbuildings. They do not seem to like a draft and consequently will be
more apt to frequent rooms or places where there is little circulation
of air. Although they are usually supposed to fly and bite only in the
evening or at night, they may occasionally bite in the daytime. One
hungry female took two short meals from my arm while we were trying to
get her to pose for a photograph one warm afternoon.

The female passes the winter in the adult condition, hibernating in any
convenient place about old trees or logs, in cracks or crevices in doors
or out of doors. In the house they hide in the closets, behind the
bureau, behind the head of the bed, or underneath it, or in any place
where they are not apt to be disturbed. During a warm spell in the
winter or if the room is kept warm they may come out for a meal almost
any time.

THE YELLOW FEVER MOSQUITO

Ranking next in importance to _Anopheles_ as a disseminator of disease
and in fact solely responsible for a more dreaded scourge, is the
species of mosquito now known as _Stegomyia calopus_. While this species
is usually restricted to tropical or semi-tropical regions it sometimes
makes its appearance in places farther north, especially in summer
time, where it may thrive for a time. The adult mosquito (Fig. 104) is
black, conspicuously marked with white. The legs and abdomen are banded
with white and on the thorax is a series of white lines which in
well-preserved specimens distinctly resembles a lyre. These mosquitoes
are essentially domestic insects, for they are very rarely found except
in houses or in their immediate vicinity. Once they enter a room they
will scarcely leave it except to lay their eggs in a near-by cistern,
water-pot, or some other convenient place.

Their habit of biting in the daytime has gained for them the name of
"day mosquitoes" to distinguish them from the night feeders. But they
will bite at night as well as by day and many other species are not at
all adverse to a daylight meal, if the opportunity offers, so this habit
is not distinctive. The recognition of these facts has a distinct
bea