256 Fiftieth Report ox the State Museum 



On South Hawk street, an English elm, which had been defoliated 

 by the first brood, was throwing out a fresh crop of leaves July 30th. 

 This recent growth was abundantly infested with both eggs and young 

 larvae. August nth, eggs and larvae were still abundant on this tree, 

 although its foliage was almost entirely destroyed, while at its base many 

 larvae and a number of pupas were seen. Two days later the pupae 

 were more abundant. August 21st this tree began to throw out a third 

 crop of leaves, and most of the pupae at its base had transformed. This 

 new growth was but little injured, although a week later other trees in its 

 vicinity were found to have been recently infested. These latter larvae 

 may have been portions of a third brood. 



A striking example of the work of the second brood and the continued 

 breeding of the insect until late in the autumn was observed on Wash- 

 ington avenue about three blocks above the Capitol. A number of 

 English elms, which had been but slightly attacked last year and had 

 suffered very little by the first brood the present year, were badly 

 injured by the second. Many of the leaves were skeletonized in mid- 

 summer, and August 19th pupae were lying abundantly around the trees. 

 Pupae continued to be found in large numbers until after the middle of 

 September, and in lessening numbers until November ist. Larvae were 

 to be found as late as October 15th. 



On Lancaster street, near Lark, there are several English elms which 

 had suftered little injury during the summer. Much to my surprise, 

 hundreds of full grown larvae were on the walk beneath the trees on 

 October 12th. Their abundance so late in the season in such numbers 

 render it quite probable that they belonged to the third brood, rather 

 than that they were belated individuals of the second. 



Observations in Troy. 

 The occurrence of two, and probably of three, broods was even more 

 conclusively shown by the observations made at Troy, N. Y. On Eagle 

 street in that city, there is a row of small English elms, which when first 

 visited on August i8th presented a sad sight. Every leaf had been 

 skeletonized, and there were only the dried remains of what had been a 

 luxuriant foliage. In other parts of the city the trees had given out new 

 leaves, which were badly infested with eggs. Eleven days later, the new 

 leafage on Eagle street was already badly infested with eggs and 

 recently hatched larvae. Four egg clusters were counted on a small 

 twig bearing but five leaves. September 9th there were many young 

 larvae and a few nearly full-grown, and numerous egg clusters — on a 



