8 



The Philippine Journal of Science 



1913 



and thorax drawn downward. (Plate I, fig. 7.) When dis- 

 turbed, they drop, the head, thorax and legs are drawn close 

 together, and they remain in this position for a few moments, 

 feigning death. If not further molested, they soon crawl a 

 short distance and then fly. As far as I have observed, the 

 adults do not feed at all; therefore, there is no direct damage 

 done by them. There was no noticeable damage done by the 

 hundreds of beetles kept under observation in the laboratory 

 for the egg-laying and other experiments. Table IV gives a 

 record of an experiment in which 100 beetles were kept with 

 20 cigars: 



Table IV. — Results of keeping 100 beetles with 20 cigars." 



Examination 



8. 



Date. 



Adulta 

 dead. 



Cigars 

 injured. 



Mar. 4 



none 



none 



Mar. 11 



26 



none 



Mar. 16 



18 



none 



Mar. 19 



53 



none 



Mar. 21 



e 



none 



Mar. 22 



1 



none 



• The open ends of the cigars had been closed previously by pasting; tissue paper over 

 them. This was to prevent the adults from entering the cigars at this point. 



The beetles in this experiment had free access to the cigars 

 and could at all times be seen running over them freely. Table 

 V shows that no damage was done to leaf tobacco by the beetles. 



Table V. — Harmlessness of adults kept on leaf tobacco.* 



(Experiments started November 14. Five adults in each lot.) 



Grade of tobacco used. 



Coarse filler 



Fine filler 



Wrapper, maduro... 



Wrapper, claro 



Wrapper, Virginian 



Amount 

 fed. 



none 

 none 

 none 

 none 

 none 



Life of adults. 



Minimum. Maximum. Average. 



Days. 



8 

 10 



8 

 10 

 10 



Days. 



10 

 19 

 17 

 16 



18 



Days. 



9 



16 



14 



14.6 

 14.6 



* This tobacco was carefully selected and the edges were trimmed with scissora so that 

 th« slightest amount of feeding could be detected. In all the experiments the adults laid eggf . 



