Bui. 1107, U. S. Dept. of Agriculture. 



Plate IX. 





jJ5w*.. 



Fig. 1.— Section of infested oak withBialf of 

 surfaco coated with tallow one-fourth inch 

 thick. The beetle emerged through it 

 without trouble as long as it was cold and 

 hard. (Table 4, Xo. v> Photograph ,by 

 H.E.Burke. 



Fig. 2. — Part of roll of alloy, one-half of which 

 was covered with tallow before it was rolled 

 around infested wood. Holes are clean in 

 untallowed section. A number of beetles 

 were caught and died in the tallow when it 

 was softened by the heat. (Table 3, No. 

 11.) Photograph by H. E. Burke. 



Ftg. 3.— Layers No. 1, Xo. 2, and Xo. 23 of 

 lead alloy rolled 27 times around an infested 

 section of oak. Shows how the numbers of 

 beetles penetrating the alloy kept diminish- 

 ing as thicknesses increased. Thirty-seven 

 went through the first, 14 through 12, and 

 only 3 through 23 thicknesses: two of these 

 went through the 24th but were stopped by 

 the 25th. This was the greatest penetration 

 obtained. (Table 2, Xo. 55a.) Photo- 

 graph by H. E. Burke. 



Fig. 4. — Beetle in gallery constructed in 

 30-mm. (l|-inch) cork. A num er of 

 other beetles were found in similar situa- 

 tions, the corks being used as stoppers to 

 vials containing specimens in alcohol. 

 Enlarged 2\ times. Photograph by H. E. 

 Burke. 



THE LEAD-CABLE BORER. 



