Further data were obtained this season on the relative abundance of 
Anopheles guttulatus and A. punctipennis. The fact was brought out in 
the survey work at Carbondale, reported by the author in the operations 
of 1918 and 1919, that the former species, considered the more effective 
carrier of malaria, was outnumbered 12 to 1 by the latter; but at Herrin 
during the season of 1920, there were exactly as many guttulatus reared 
from the monthly collections as punctipennis. 
CONCLUSION 
Control measures were discussed in full in the report of the opera- 
tions of 1918 and 1919, mentioned in the introduction to this article. At 
Herrin, owing to the necessity of maintaining ponds, drainage—one of 
the best methods of control—can not be employed. It is quite likely that 
cleaning the edges, stocking the pond with fish (especially with top-min- 
now), or applying oil in some way, will be found to be the most practical 
methods. 
