1915] Behawior of Anopheles 225 
The homes of the Americans are well built, well screened with 
18-mesh copper screen, and are raised on concrete posts. 
Weekly inspections are made of screening and floors and defects, 
such as holes or cracks through which mosquitos can enter, are 
quickly repaired. A daily search for mosquitos is made in all 
barracks by expert negroes and thus many Anopheles are killed 
before they become dangerous. All doors have self-closing 
devices. 
The quarters of the negro, Spaniard and East Indian are 
likewise well screened and elevated from the ground. The 
difference between them and those of the Americans is that 
more people sleep in labor barracks, and due to the increased 
perspiration, as well as less body cleanliness, these barracks 
become veritable traps for mosquitos. Advantage was made 
of this fact and the “‘C. H. Bath’’ mosquito traps were attached 
to such buildings and through them large numbers of mos- 
quitos were caught. 
At New Gatun, a native village adjacent to Gatun proper, 
the conditions are much the reverse. The dominant figure 
here is the West Indian, and his home, devoid of screening, 
rivals in capacity our New York tenements. The population 
was about six thousand. The only effective anti-malarial 
measures are free medical aid, good ditches and the ceaseless 
dripping of larvacides. Orenstein (1912-b) reports three times 
as much malaria originating in New Gatun as in Gatun proper, 
and this increase is due to exposures to infection through lack 
of screening. 
In daily habits the people vary greatly. When the day’s 
work is ended, the American usually seeks his only place of 
amusement—the Y. M. C. A., or he remains in his room. In 
either case he is fairly well protected from Anophelenes. Sat- 
urday nights and Sundays, since the Canal Zone is ‘‘dry”’ 
territory, he procures his alcoholic preference in Colon or 
Panama cities, 1. e., unless he keeps it in stock in his trunk. 
The Spaniard delights to lounge outdoors, remaining so till 
late at night. Mosquitos find no difficulty in reaching them. 
The negro likewise prefers to roam about, and this unrest is 
probably but the natural reaction after a day of hard work. 
The practice, though, is dangerous. The negro cannot speak 
through a screen door; he must open it wide, and of course 
