101 



fasciata. This method is objectionable on account of the yellow stains 

 and disagreeable odor. 



Pyrethrum burned in the proportion of 1 pound per 1,000 cubic 

 feet with an exposure of two hours will stupefy Stegomyia fasciata; 

 it requires 2 pounds to kill them outright. 



From the limited number of experiments made and from previous 

 experiments we consider sulphur dioxid the best of the gaseous insec- 

 ticides for this purpose. 



Formaldehyd gas is not an insecticide, and therefore not applicable. 



O 



