114 JOURNAL OF ECONOMIC ENTOMOLOGY [Vol. 9 



same conditions, but I think all the beetles in the cage experiments 

 died from the effects of the arsenate of lead. 



Mr. W. C. O'Kane: The question in my mind is whether some 

 of the insects in your experiments may have died because they were in 

 cages. 



Mr. S. W, Bilsing: Where the beetles died in confinement they 

 were in cages. Some are still in the small cages. 



Mr. W. C. O'Kane: How large are the cages? 



Mr. S. W. Bilsing: We carried on the experiments in small 

 cages which were about 18 inches high, on the life-history of the insect, 

 and checked up these conditions with the conditions in the field. 



All of the beetles that were confined in large cages were dead in 48 

 hours and a part of them in 16 hours. 



Mr. J. L. King: I Avould like to ask if all these beetles were of 

 one sex? 



Mr. S. W. Bilsing: I used both males and females in confining 

 them in a cage. The males died just the same as females. Perhaps 

 the males did not feed quite as much as the females. 



Mr. H. a. Gossard: I would like to ask how the schedule for 

 spraying pecans fits in with the schedule for destroying the case 

 worm, the bud worm and other pecan insects; does this have to be an 

 independent spray? 



Mr. S. W. Bilsing: I have never done any work on the case 

 worm but I do not believe it would fit in. 



Mr. C. L. Metcalf: These experiments have been intensely 

 interesting to me because of the parallelism between this species and 

 Oncideres cingulata in North Carolina. I would like to ask Mr. Bilsing 

 if he made any experiments to indicate the most favorable conditions 

 for passing the winter? Whether he found any difference in the 

 percentage of those that live through the winter when they were de- 

 pendent on dry or moist conditions, and also how the limb was girdled 

 when the twig sloped downward? 



Mr. S. W. Bilsing: In answering the first question, I found in 

 rearing material for my work, moisture had a great deal to do with the 

 number of larvae which survived. A small number lived over in the 

 limbs which remained on the ground. In order to secure sufficient 

 material it was necessary to tie a great number of these branches up to 

 the limbs of various trees. In answering the second question I will 

 state I have never observed any beetles girdling the branches which 

 sloped downward. 



Mr. R. W. Leiby: Have you noticed any egg parasites? 



Mr. S. W. Bilsing: Xo. A considerable per cent of these 

 insects are parasitized by a tachinid fly. I have not done a great deal 

 of work on this but I expect to work on it in the future. 



