THE LEAD-CABLE BORER IIST CALIFORNIA. 



25 



1 



1 



No adult penetrated all of the layers. 



Eight emerged and escaped through the fourth, 



leaving two in fifth. 

 Three emerged and escaped through the fourth, 



leaving one in fifth. 

 This was greatest penetration, about 1 inch. 

 Six emerged through first and escaped. Layers 



unevenly rolled. 

 Twelve emerged through second and escaped. 

 Last two emerged at fifth and sixth and escaped. 

 Eighteen emerged thi'ough second and escaped. 

 Three strips were rolled together. 

 Two emerged through thi.d and escaped. 







Four emerged through second and escaped, one 



stuck in three. 

 One emerged through third and escaped, leaving 



none for fourth. 

 The one that started went through all three. 

 No. 2a lead was rolled down or next to section. 

 Same as No. 22a except that No. 2a lead is wider. 

 No adults emerged through zinc. 









other adults penetrated the various thicknesses, 

 as foUows: 



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Number 

 of layers 

 or thick- 

 nesses 

 used. 



10 to 11 

 4 to 5 



4 to 5 



26 to 27 

 Ito 2 



2 to 3 

 6 to 7 



2 to 4 

 6 to 9 



3 to 4 

 Ito 3 

 3 to 4 

 2 to 3 



2 to 3 



3 to 4 



2 to 3 

 3 

 2 to 3 

 2 to 3 

 2 to 3 

 Ito 2 

 1 



Kind of metal used. 



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2047—22 4 



