CARL VON HEYDEN. 51 



p. 381). I found the larvce in the middle of October near 

 the house of the head-forester at Frankfort, mining in the 

 leaves of Populus tremula. The mine forms an elongate, 

 black-brown blotch from the leaf-stalk between the edge of 

 the leaf and the first side rib, or between the first side rib 

 and the midrib ; it widens anteriorly, and is sometimes five 

 lines long. There is often a mine on each side of the mid- 

 rib. 



The moth deposits its egg at the end of the leaf-stalk, in 

 which the lai'va mines till the end of September 'or beginning 

 of October, and then passes into the leaf. This portion of the 

 leaf-stalk is flattened sideways, but tolerably [thick. The 

 cocoon is oval, arched above, rather shining, brown. 



The moth made its appearance in the room at .the end of 

 April. (1860.) 



Pterophorus microdactylus, lib., Heyden (E. Z. 

 1860, p. 125). The larva feeds in autumn in the stems o 

 JEupatorifmi cannahmurrif winters there, and the perfect 

 insect makes its appearance at the beginning of May, 

 escaping through a small round hole in the stem. 



This occurs in all localities round Frankfort, where its 

 food-plant grows. (1826.) 



Pterophorus xanthodactylus, Tr., Heyden (E. Z. 

 1860, p. 125). I found the larvae in great plenty in light 

 fir woods on the sandy plain at Jugenheim in the Odenwald 

 on the Jurinea Pollichiiy Koch, at the end of July and 

 beginning of August. The larva is very sluggish, and 

 readily lets itself flill from its food plant to the earth, where 

 it curves itself together. It lives on the underside of the 

 leaves, feeding on the parenchyma, and leaving the upper 

 epidermis untouched. When the larva is feedins^, it loosens 



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