Table A. --'Number, size, and sex ratio of beetles emerging from areas on the 

 same trees where radiographic and bark-removal sampling were used. 



Average Standard Number/ 

 Number-^ length deviation 50 .4 cm^ 



-----OT77----- 



RADIOGRAPHIC METHOD 



Male 6 4.64 0,62 1.0 



Female 15 5.07 .53 2.5 



Unidentified^ __3 -- -- .5 



Totals 24 4.0 



BARK -REMOVAL METHOD 



Male 54 4.75 .49 9.0 



Female 90 5.11 .51 15.0 



Unidentified^ Th_ — -- 3^ 



Totals 167 27.8 



^ Sex ratios (males to females) are 1:2.50 in radiographed areas, and 1:1.67 in 

 nonradiographed areas. 



^ Beetles could not be sexed because of broken abdomens. 



Figure 2. — Radiographs of 

 good quality can be 

 produced where moisture 

 content of wood and 

 bark is uniform and a 

 filter is used to 

 prevent overexposure 

 of thin areas. 



9 



