CARL VON HEYDEN. 41 



quadripartite covering, future more accurate investigation 

 must decide, whether the moth truly belongs to the genus 

 Lyonetia, (185*2.) 



Cemiostoma Susinella, H. S., Heyden (E. Z. 1860, 

 p. 123). The larva lives gregariously in July and August, 

 mining large brown irregular blotches in the leaves of the 

 aspen {Populus tremula). It is abundant in the woods 

 about Frankfort and in the Taunus. More rarely it occurs 

 in the leaves of Populus Italica, on which I have found it 

 at Mombach. 



When full fed it quits the mine and spins a white cocoon, 

 with a quadripartite covering like that of C. Lahurnella. 



The imago makes its appearance in the May of the fol- 

 lowing year. (1825.) 



Cemiostoma Wailesella, Stainton, Heyden (E. Z. 

 1863, p. 346). The larva mines the leaves of Genista 

 tinctoria from the middle of June to the beginning of 

 July. The mine is at first a small, round, brown spot, from 

 which issues a fine linear track, along which the larva, still 

 very small, proceeds to make a large mine, at first also 

 round, but afterwards occupying the entire tip of the leaf, 

 and often, indeed, covering the whole leaf. The black- 

 brown excrement lies in this mine in great plenty, and 

 forms indistinct concentric circles. If the larva finds a 

 sufficiency of food in the leaf, it only eats the upper half of 

 the parenchyma, so that the underside of the leaf remains 

 green. Between two leaves, or between other objects, the 

 larva spins a small, white, boat-shaped cocoon, with a large 

 four-lobed covering, as in several allied species. 



The imago appears the beginning of July. (1855.) 



