660 JOURNAL OF ECONOMIC ENTOMOLOGY [Vol. 17 
the 10 % Kayso Oil Emulsion applied as a dormant spray, all sprays 
were applied after the eggs had hatched and as the data shows some of 
the emulsions as well as the lime sulfur gave partial control but not 
enough to warrant recommending them. For the regular dormant 
spray for San Jose Scale a 2% emulsion is usually recommended. In 
this work it will be noted that a 10% oil emulsion was tried and still not 
enough control was obtained to recommend its use. From the results 
obtained it seems evident that lime sulfur or lubricating oil emulsions 
cannot be recommended for complete control of apple aphids. 
ANOTHER LEAD BORING BEETLE 
By W. J. Chamberlin, Forest Entomologist, Oregon State College 
A rather remarkable specimen of insect injury has been submitted to 
the writer by the Portland Railway Light and Power Company. Owing 
Fig. 19.—Work of Callidium? in cedai and lead. A portion of the tunnel in the 
wood and the exit hole thru almost 3/16 of an inch of lead can be seen. 
The granulated material stored in the mine is lead borings. 
to interference of current a portion of underground cable was removed 
and found to have been punctured by insects. The cable covering was 
