2/2 MAINE AGRICULTURAI, EXPERIMENT STATION. I913. 



established for Europe. Although the life cycle has not yet 

 been followed through in America, specimens which I have seen 

 collected from California, Oregon, Alaine (1913), and Ontario 

 (fall migrants, 1913) are, I believe, identical with uliui (fodiens) 

 of other countries and will doubtless prove to have the same 

 cycle here. As will be seen from figure 138A and B the roll 

 caused by ulmi is of the same type as that caused by americana, 

 and as both species extend from Maine to California it is not 

 unlikely that they have been confused in our literature. So far 

 as I know at present S. nliui from Ulnius americana is not 

 recorded nor S. americana on the species of elm accepted by 

 S. ulmi, but this whole question needs further study. 



The first collection of this species made in Maine was at Bath 

 June 23, 1913, when a box of the leaves containing stem mothers, 

 pupae and migrants were received with the statement that more 

 than a bushel of such leaves had been taken from a Camper- 

 down elm (Uhnus scabra Alill. var. pendula). Another collec- 

 tion from the same place was secured July 8. 



On August 31, 1913, while in Bar Harbor I collected curled 

 leaves from an English elm (Ulmus campestris) which con- 

 tained molted pupal skins, the antennal structure of which 

 proved the work to be that of ulmi. No live specimens were 

 present, of course, at that date. The infested elm, though a 

 good sized tree, had hardly a normal leaf. However much alike 

 their rolls look the insects inside are readily distinguished in all 

 their stages. 



Fig. 136. The antenna of the stem mother. It is at once 

 distinguished from that of the corresponding form of the other 

 species treated in this paper by the very much abbreviated termi- 

 nal joint. 



Fig. 137. The antenna of the spring migrant is strikingly 

 different from any other elm species known to me. The annu- 



