12 INSECTS AFFECTING HEALTH OF MAN OR ANIMALS. ae 
; 
THE YELLOW-FEVER MOSQUITO.! 
Yellow fever can be transmitted only by the bite of one kind of 
mosquito (figs. 13 to 15). Itisa house mosquito and is not found away > 
from human habitations. It may be readily recognized by its — 
striking ornamentation. 
The back, just behind thag 4 
head, bears a lyre-like sil- — 
very pattern and the legs — 
and hind part of the body 
are banded with white ina ~ 
conspicuous manner. This — 
mosquito is active chiefly — 
during the bright part of 
the day, and particularly — 
in the early part of the af-— 
ternoon. 
The yellow-fever mos- — 
quito breeds in water in ~ 
receptacles in or near 
houses, such as water jars, 
rain barrels, cisterns, rain — 
troughs, discarded tins © 
and bottles, etc. It does 
Fic. 10.—Eggs of a malaria mosquito, Anopheles quadrimacu- not breed in natural collec- 
as resting on surface of water. Highly magnified. (How- tions of wat er, su ch as 
swamps, pools, or rain 
puddles. The position of the larva when at the water surface to take 
in air is very characteristic. The body hangs nearly straight down, © 
while in many other mosquito larve the body is held more obliquely. 
THE HOUSE MOSQUITO, 2 TRANSMITTER OF DENGUE FEVER AND FILARIASIS. 
This dull-colored mosquito is also confined to the vicinity of 
houses, as is the yellow-fever mosquito. It is active at night and 
very annoying, not only by its 
bite but also by its song. It 
breeds in the vicinity of habita- 
eh tions and the larve are to be 
found in rain barrels and other q 
ast . Fig. 11.—A nopheles quadrimaculatus: Larva in resting 
receptacles, as well as ditches, position. Greatly enlarged. (Howard.) 
gutters, or even streams eelichl 
, polluted by sewage. In fact it prefers foul water, and highly polluted 
i water induces it to multiply enormously. Under these conditions it 
may quickly become a serious pest. The larve may be distinguished 
from those of the yellow-fever mosquito by the much longer breath- 
1 Aedes calopus Meig. 2 Culex quinquefasciatus Say. 
