206 Arthropods as Hosts of Pathogenic Protozoa 
A'cdes calopus, more commonly known as Stegomyia fasciata or 
Stegomyia calopus (fig. 134) is a moderate sized, rather strikingly 
marked mosquito. The general color is dark-brown or reddish- 
brown, but the thorax has a conspicuous broad, silvery-white curved 
line on each side, with two parallel median silvery lines. Between 
the latter there is a 
slender, broken line. 
The whole gives a lyre¬ 
shaped pattern to the 
thorax. The abdomen 
is dark with silvery- 
white basal bands and 
silvery white spots on 
each side of the ab¬ 
dominal segments. 
Legs black with rings 
of pure white at the 
base of the segments. 
Size of the female 
3.3 to 5 mm.; male 3 
to 4.5 mm. 
It is pre-eminently 
a domesticated species, 
being found almost 
exclusively about the 
habitation of man. 
“ Its long association 
with man is shown by 
many of its habits. It 
approaches stealthily 
134. The yellow fever mosquito (Aedes calopus), (.\7). from behind It re- 
After Howard. 
treats upon the slight¬ 
est alarm. The ankles and, when one is sitting at a table or desk, 
the underside of the hands and wrists are favorable points of attack. 
It attacks silently, whereas other mosquitoes have a piping or hum¬ 
ming note. The warning sound has doubtless been suppressed in 
the evolutionary process of its adaptation to man. It is extremely 
wary. It hides whenever it can, concealing itself in garments, 
working into the pockets, and under the lapels of coats, and crawl¬ 
ing up under the clothes to bite the legs. In houses, it will hide 
