Feb., '04] ENTOMOLOGICAL NEWS. 55 



the soft green tissue which fills all the space between the 

 upper and lower skins and the large veins. Usually they eat 

 out all the mesophyl between two parallel veins and as far as 

 they can reach in the other two directions without entirely 

 leaving the case. It will be remembered that the case is at- 

 tached to the leaf and its door is exactly over the hole in the 

 epidermis. Once or twice I have seen a caterpillar voluntarily 

 leave the case altogether, but usually they keep a tight grip 

 upon the case, and when disturbed duck back into it with sur- 

 prising rapidity. 



Adult moths emerged from the cases on July 19th 



and continued coming out for about two weeks. 



They are light grey in color with beautifully fringed 



wings. They spread a little over half an inch. I 

 ^^.^ kept a number of them in my breeding cage hoping 

 J^m8^ to get some eggs, but in this I was disappointed. 

 ^H|pr On Jul}' 31st I found a minute yellow speck on 



an elm leaf which under the microscope proved to 

 be a mass of deeply pitted lemon 3'ellow eggs. Since none 

 of the eggs hatched I am not sure what they were, but as they 

 closely resembled the eggs of another species of Coleophora, as 

 described by Professor Slingerland, I am inclined to believe 

 that the\' were the eggs of this species. 



Although none of the eggs hatched in my cages, young 

 case-bearers were abundant on the English Elms during the 

 first week in August. They evidently construct their cases 

 almost as soon as they are hatched, for I have never been able 

 to find one without a home. The young brood do not differ 

 materially in habits from the old. They construct their cases 

 as neatly, and in the same manner as the spring brood did. 



With the approach of Autumn I was anxious to know 

 whether the case-bearers would fall with the leaves, as in that 

 event they could easily be destroyed by gathering the leaves 

 and burning them. I was lead to hope that such would be the 

 case, since in m}- breeding cages they adhered tenaciously to 

 the leaves even after they had withered and become quite dry. 

 In fact I often had to detach them from the 6.xy leaves and 

 place them upon the fresh food in order to keep them alive. 



