1915] Behavior of Anopheles 265 
abdomen hangs vertically, the mosquito cannot gorge itself 
as much as when in other positions. By placing a paper prop 
under the abdomen, so as to sustain the weight of the body, 
the mosquito was able to gorge itself to its utter satisfaction. 
Leather leggings were rapidly lined with mosquitos. By 
covering one legging with light colored paper, very few mos- 
quitos alighted thereon. When black paper was used, more 
mosquitos were attracted. When the leggings were thrown 
away, mosquitos still alighted on them in hopes of finding 
flesh. After sprinting, so as to promote perspiration, and 
then covering the bare feet with white paper, mosquitos alighted 
in numbers on the paper, but when black paper was used, 
nearly triple the number of mosquitos appeared. The sox of 
negros when thrown into the bush were found to be covered 
with mosquitos. All this tends to show a similarity of odor 
between khaki, leather and flesh, and that darker colors are 
preferred to light ones. 
At the breeding place, and later confirmed at the laboratory, 
interesting feeding reflexes were observed. The Anopheles 
and Aedes were so voracious that their persistence in getting 
their proboscis into flesh was remarkable. Once inserted, the 
mosquito became almost insensible to pain or to intense light 
or heat. 
Hitting the mosquito with a pencil was not enough to cause 
it to fly away. Bright sunlight focused upon it with a mirror 
was effective only after the stomach was well gorged with blood, 
and quite likely the mosquito left for other reasons. When 
heat rays were applied to the abdomen by means of a lens, a 
mosquito quickly flew away. To continue and learn how far 
mutilation could proceed, the abdomens of eight mosquitos 
were quickly severed with fine dissecting scissors. In three 
cases the mosquitos kept on sucking blood despite the injury. 
The remaining five flew away, and of these four returned for 
another suck of blood. This sort of behavior savors of the 
fictitious, however, it proves how deeply implanted may be a 
stimulus such as hunger, and how slavishly it is obeyed. 
When allowed to feed unmolested, and holding the hand 
toward the sun, the writer was able to observe the passage of a 
liquid through the proboscis into the flesh, presumably salivary 
fluid, and following this, he could see the blood being sucked 
