AND OTHER INJURIOUS INSECTS OF I907 AXn I908. I5 



growth than was the case on the 

 trees in the orchard. This growth 

 was as large (in diameter) on 

 this nursery stock, however, as 

 the second year's growth from the 

 present was on the trees in the or- 

 chard. 



It should be noted here that 

 Mr. Webster (Jour. Econ. Ent. 

 Vol. I. No. 5, p. 326) says that the 

 winter egg pockets of E. iiiali 

 Kig ('. Nymph of /■:. ,„ii' within Us ^yhich he found "on three-year-old 



poiiL'li or lilister, n,iicli eiiUuf. I cl. Oiigi- - 



"^'- apple stock" were "in the bark on 



the lower portion of the trees, be- 

 thc first branches." This location of the eae blisters de- 



iow 



t>t3 



scribed by Air. Webster is for young nursery trees of three 

 years* growth, precisely the same position as described above for 

 larger trees, for on three-year-old nursery stock "the lower portion 

 of the trees below the first branches" would be the second year's 

 growth from the present. The positions of the egg blisters, 

 then, in both cases have the same relation to the age of the growth 

 of the bark within which they were deposited. Distance from the 

 ground does not appear to have the influence on the location of the 

 egg-blisters of this species which one might naturally expect. To be 

 sure, these blisters seem to be somewhat more abundant on the lower 

 branches, but the upper branches also have a considerable supply. 

 Branches at dififerent heights were also examined, and these blisters 

 were found as high as seventeen feet and three inches from the ground. 

 Two branches over twenty feet high were examined, but no blisters 

 were found at that height. Only rarely were these blisters found on 

 large limbs and trunk, though other blisters, similar in appearance, but 

 somewhat larger, were common on these portions. 



It seems probable that the adults of E. niali choose, for fall egg- 

 laying, the particular portions of the tree where the blisters are found 

 to be most numerous, because those portions bear bark which is best 

 suited to protect the eggs and is, at the same time, tender enough to 

 make oviposition easy. The newest growth is not chosen, apparently, 

 either because its bark is not dense enough to afford satisf^ictory pro- 

 tection from wdnter weather, or because its more rapid growth might 

 crush the eggs. It is quite probable that the old bark on the main 

 limbs, and on the tnmks of the trees is too tough for easy ovi])osition. 



