28 
On the south side of the ba} 7 ou of Cannons Creek, beginning about 
a mile and a half from its mouth, there was a field covered with 
partly submerged saplings, dying and casting their leaves. In this 
field, from the beginning to about half a mile higher up the creek, 
this leaf floatage sheltered man} 7 larvae. Larvae were found all along 
this creek, from above this place to live water. In the live water and . 
in sloughs, small marshes, and “potholes” adjacent to it, Anopheles 
were breeding profusely. Many evidently were washing down the 
creek, but the lower groups were of all ages and too far from live 
water to have been washed down. They were evidently from eggs 
deposited about where we found them. 
Practically nothing was found on the banks of the bayou of this 
creek; 1 nor was anything found in its lower reaches (1^ to 1! miles 
from the river). Two visits were paid to this place, July 28-29 and 
August 13, and while the breeding was not quite the same the second 
time, the absence of breeding was the same. 
Although many creeks were examined, practically no creek bayou 
except Hellers was found breeding. A small number was found 
half way up Terrible Creek, and there were enough to be of sanitary 
importance in a limited area against a steep bank on Coles Creek 
bayou, but generally the above statement was true. 
Hellers Creek bayou covers as much area as some ponds, though 
less than Cannons. It is continuous on the north with a long exten¬ 
sion of shoal water, running about 2 miles up the river behind the 
bank. This slough was free from larvae, except in a rather extensive 
fringe of bulrushes next to the river. It was alive with minnows. 
The bayou, however, was producing mosquitoes sparsely or moder¬ 
ately for a space of about half a mile on the south side, in fine floatage 
and drift, and to a lesser extent in leaf floatage lodged against trees, 
logs, etc., or just adrift. The shallow bank, fairly clean, was not 
breeding them, or breeding so little as to be of no sanitary importance. 
It was lined with minnows, many of which were Gambusia. This 
breeding of mosquitoes covered two areas: The first about 300 yards 
long and, after a space which was barren, one of about 200 more. Its 
total production, therefore, was large. This was in flooded woods. 
SILVER-LEAF GRASS. 
In the upper part of Hellers Creek bayou and in the part to the 
north of the creek we found very few larvae; but in a bight above a 
bridge which crosses the creek we found a mass of water grass in 
which mosquito larvae were breeding profusely. They were of three 
kinds, including Anopheles quadrimxwvlatus. This plant covered a 
large area (one-half acre or more). It grew with its leaves flat on 
1 Those spoken of above were away from 'the bank—300 to 400 yards or more. 
