43 
of the innumerable small fish, but were occasionally observed in small, 
isolated pools on the mud, and were still more common in small pools 
at the edges of swamps. It is a noteworthy fact that they did not 
occur in swamp pools in such numbers as in the streams and rock 
pools among the hills of Sierra Leone. ‘‘ These rock pools would 
appear to be the most suitable conditions for the breeding of 
Anopheles.” 
The avidity with which Anopheles larve under observation in 
Washington fed upon alge spores of the genera previously mentioned, 
and the character of the breeding pools found here, indicate that with- 
out doubt similar conditions will prevail generally in this country, and 
Anopheles will always be found to breed most abundantly in fairly 
permanent stagnant pools of water uninhabited by fish, but more or 
less covered with green scum. 
OTHER SPECIES OF ANOPHELES. 
As appears from the synoptic table on previous pages, we have in 
the United States, so far as ascertained, three recognized species of 
oe 
Fie. 18.—Anopheles punctipennis: Female, with male antenna at 
right, and wing tip showing venation at left—enlarged (original). 
this genus. A. guadrimaculatus has just been figured in all its stages, 
and the accompanying illustration (fig. 18) shows very well the beautiful 
