i8 TiiK Appr.i'". i.i:.\i' ii()riM;K 



spect to the new growth of tlic ehn, to what the apparent egg-bHsters of 

 E. mall are on the apjile. He was able to discover no difiference between 

 these ehn bHslers and the apple blisters. Their measurements were the 

 same, and they were the same in general appearance. A number of 

 these elm blisters were opened and the eggs which they contained were 

 hke those in the ai)ple blisters. These l)listers on the elm were much 

 less numerous than those on the apple branches. It seems probable 

 that these elm blisters are blisters of E. iiiali. or of some closely allied 

 form. The fact that the elm and the apple are not closely related 

 plants, argues, of course, against this view, Init it is quite ]K)ssible 

 that the character of the bark which a tree bears on its small branches 

 may have more to do with this matter than does the relationship of 

 the species. Franklin examined a considerable number of other kinds 

 of trees and shrubs, but found no blisters on any of them which resem- 

 bled these, which appear to be those of E. inali, though egg-blisters of 

 other species were found in abundance. These, however, could be 

 easily distinguished by their size, shape, depth in the bark, and general 

 appearance. Among the trees and shrubs thus examined for these 

 blisters were plum, ])oplar (two s])ecies), willow (two species), sugar 

 maple, soft maple, mountain ash, white l)irch. hackberry, boxelder. 

 elderberry, gooseberry, currant, oak, cherry, liawthorne, cornus. lilac, 

 spruce, pine (white), and cedar. 



The Summer Egg: Xymi)hs found emerging from petiole of 

 clover, Fig. 7 colored i)late, and from petiole of apple, indicate two 

 places of oviposition during the summer season. From the large 

 variety of food plants upon which it is found abundantly in summer, 

 it would seem as though it must oviposit upon a great variety of 

 growths. 



We sectioned clover leaf petioles in .August in looking for the 

 eggs. We found the inr.er tissue broken, and a])pe iring as th )ugh 

 the egg had been placed longitudinally in about the center of the 

 petiole. After the emergence of the nymph the hole which affords 

 it exit closes, and leaves only a narrow horizontal slit, barely notice- 

 able. Dahlias examined September 30th had adults and nyiuphs upoi, 

 stem and petiole. Minute slit-like scars were also found on these 

 plants. In this connection it is interesting to note Mr. Ainslie's ob- 

 servations in 1*^07, which tally with those made this vear. 



"On the ])etioles of a very few of the leaves (apple) something 

 appeared to be the matter. This took the form of a small, discolored 

 pore on the petiole of the leaf. In one or two this pore was open, 

 but in the others it was closed and was evident from a slight discolora- 



