OF WASHINGTON, VOLUME XI, 1909. 165 



The cocoons have been found introduced upon fruit trees 

 in Hamburg, Germany (Kraepelin), San Francisco, California 

 (Dept. Agriculture), and New York(Joutel) ; but in Massa- 

 chusetts they were introduced in sufficient numbers so that 

 the species reproduced and became established in a small 

 district in Dorchester in the suburbs of Boston. The place 

 is entirely built up to houses, but there- are many open spaces 

 with trees and shrubbery, as well as trees along the streets. 

 A park of considerable extent (Franklin Park) is in the c! 

 vicinity. Conditions are therefore favorable for the contin- 

 ued existence of this interesting species in America; but 

 unfortunately Dr. H. T. Fernald, in an excess of economic 

 zeal, which we consider premature, destroyed large numbers 

 of the cocoons, for fear that the insect might become a pest. 

 What effect this action has had upon the continuance of the 

 species we do not know. It is to be hoped that the moth has 

 not been exterminated. Some thirty of the cocoons were 

 allowed to emerge in the open in Washington and many e 

 and young larvae were subsequently observed. All, however, 

 died in the third or fourth stage, probably because the location 

 was too dry and open. The climate can scarcely have been 

 too warm, considering the distribution of the species in Asia. 

 I have several times observed young Cochlidian larvae to die 

 when placed upon trees in the open that I had thought favor- 

 able to them, but which proved to be dry and sunny. The 

 moths, in ovipositing, doubtless avoid such situations. The 

 eggs laid at Washington, while deposited by moths issuing at 

 large, were necessarily laid in the vicinity of the place where 

 I had placed the cocoons, and it was evidently an unsuitable 

 one. 



The eggs are laid singly upon the undersides of the leaves, 

 and the larvae live in the same situations, not moving greatly. 

 yet passing from leaf to leaf occasionally. They eat at first 

 the parenchyma of the leaf from beneath in little patches, later 

 the whole leaf from the tip, all as in the manner usual in the 

 family. Eight stages occurred in my specimens. The larvae 

 do not feed in the first stage. The adults rest with the tip 

 of the abdomen against the support, the legs extended, in the 

 manner of our Natada nasoni Grote and other Cochlidians. 

 Their period of flight is short, as no nourishment is taken in 

 the adult state. 



The species appears to be common in its home. Grae-cr 

 found the cocoons "sehr gemein" at Blagoweschtschensk, 

 Amurland. where he found cocoons on all deciduous tr< 

 especially on birches, in all the gardens and in the forest; 



