32 B. C. ENTOMOLOGICAL PROCEEDINGS, 1912. 



Mr. Brittain — Importers would be only too glad to import 

 infected stock to be cleaned here. Has anyone had any exjjerience in 

 fumigation by dry heat ? 



Mr. Treherne — Certain experiments in the States, where mill 

 and grain insects have been subjected to 122 degrees of dry heat have 

 showfn that all eggs, larvae, and adults have been killed. 



Mr. Wilkinson — My experience with the use of CS2. in Victoria 

 has been that it is very satisfactory. I remember fumigating a carload 

 of beef scraps from Chicago which was alive with predaceous beetles of 

 all kinds. The gas was highly satisfactory. 



Mr. Lyme — The United States will not allow raw hides coming 

 from Australia through V^ancouver into their country unless accompanied 

 by a certificate of ours certifying that the hides have been duly fumi- 

 gated by CS2. 



Mr. D.avidson — How long do you expose to fumes? 



Mr. Lyne — Thirty-six hours is full exposure. Less will not 

 guarantee to kill all eggs of all species and the Mediterranean Flour 

 Moth is also not affected by a lesser time. 



Mr. Taylor — What effect in comparison would Hydrocyanic 

 Acid gas have ? 



Mr. Lyne — The two gases have opposite properties in many 

 respects and the differences account for their respective uses. Hermetically 

 sealed cocoons of the Brown Tail Moth are not penetrated by Hydro- 

 cyanic Acid gas and many borers in root or stem or larvae confined in 

 their coccoons are immune the same way. 



Mr. Chairman — I now take great pleasure in calling upon Mr. 

 Brittain for his paper and at the same time introducing him and wel- 

 coming him to this Province. He has recently been appointed Provincial 

 Entomologist and Plant Pathologist for this Province and we hope as 

 years go on he will be able to further our knowledge on British 

 Columbia insects. 



BENEFICIAL INSECTS. 



by 



W. H. Brittain, 



Provincial Entomologist and Plant Pathologist. 



If we look into the history of our insect enemies we find that as 

 far back as our records go they have been a source of annoyance and 

 financial loss to those who make their living from the soil. As to 



