226 : THE ENTOMOLOGIST. 
was not easily distinguished from them, at first at any rate, they 
were not too easy to negotiate. In addition to observing that 
they were in some way connected with elm, I very soon noticed 
that almost all my captures were around the pollarded trees, 
although I could not be certain that they did not equally frequent 
the tall trees, the tops of which would of course be beyond my 
vision in the case of such a small object. So impressed was I 
with this connection with elm that I brought home several 
females and sleeved them over branches of this tree in the garden 
here for ova, but the result was nil. 
I was not able to re-visit Wicken in June until the year 1918, 
but in that year I spent a fortnight during the latter part of 
June largely occupied in trying to solve the leguminana problem. 
I found the moths fairly common, and it soon became apparent 
that the opinion formed on my previous visit of a connection 
with elm was correct, but what was this connection? It took long 
and careful observation before I got any nearer. It occurred to 
me that they might possibly feed in the seeds, but I could not 
find any seeds, and the few females I met with seemed to 
frequent mostly the bases of the branches where they joined the 
trunk, rather than farther out where the seeds might be expected 
to grow. Eventually I found a very good tree, around which 
both males and females were common. It was a pollard of course, 
very rugged, and with a fairly luxuriant growth of ivy growing 
against its trunk, but not by any means covering it. I thought 
I had solved the mystery, and that the larve fed in the berries of 
the ivy. A close examination of a large quantity of berries did not, 
however, reveal any signs of ova, and so that idea was exploded. 
Eventually on June 30th I saw a female flying slowly and in 
a business-like way around an accumulation of dead and dying 
bark which covered an excrescence in this elm trunk where it had 
been injured by the axe in cutting off branches yearsago. I 
watched her settle on the excrescence, crawl out of sight under- 
neath a piece of dead bark, emerge and disappear again behind 
another piece of bark; after she had done this several times I set 
to work breaking off pieces of dead bark, and with the aid of a 
lens detected several undoubted tortrix eggs. I felt quite 
satisfied that I had at last read the riddle. Unfortunately during 
the next few weeks I was unable to examine these eggs daily. On 
August 4th I found the larve had emerged, but there were no 
signs of them, and subsequent examinations of the bark were not 
more successful in detecting larve. 
In July, 1919, I was again at Wicken, and examination of the 
excrescences on this and other elm trees resulted in my finding 
a considerable quantity of red-brown frass, and under pieces of 
bark several cocoons, which, with the pupa cases attached to them 
were evidently those of a tortrix. In May, 1920, I made another 
attempt, and by wrenching off pieces of bark which showed by 
