CARL VON HEYDEN. ' 33 



its natural history in the same locality in which Reutti cap- 

 tured the imago. (1861.) 



Gracilaria limosella, Dup., Heyden (E. Z., 1862, 

 p. 362). In company with Herr Anton Schmid and Herr 

 Miihlig, I found the larva in the middle of September, in 

 the wood at Mombach, near Mayence, on Teiicrium Cha- 

 mcedrys. It mines the leaves, which hence appear swollen on 

 the upper side, whilst the underside is drawn together in 

 folds. It changes to the pupa state within the mine, and the 

 moth appears at the end of June and beginning of July. 

 There is an earlier brood. (1858.) 



Gracilaria pavoniella, Metzner, Heyden (E. Z. 1861, 

 p. 37). I found the larva in the middle of October, at Jugen- 

 heim, on the Bergstrasse, mining the leaves of Aster amel- 

 lus. The mine is large, often an inch long, generally occupy- 

 ing the entire breadth of the leaf towards the tip ; it is reddish- 

 brown. In the middle of it, along the mid-rib, is a more or 

 less inflated, fusiform space, on the upper surflice of the 

 leaf, with a longitudinal keel; beneath this is the usual 

 abode of the larva. It frequents plants which grow under 

 the shade of trees, and it is only in the larger radical leaves 

 that we sometimes find two mines in one leaf. It only rarely 

 happens that the mine is on one side of the mid-rib. 



Before winter the larva becomes of a lemon-yellow, but 

 does not quit its mine till March or April. In some conve- 

 nient corner it spins an oval, flat, whitish, transparent cocoon. 

 The imago appears in the middle of May. (1859.) 



(E. Z. 1862, p. 176.) Frey has already described this 

 larva in his " Tineen und Pterophoren der Schweiz ;" he 

 found it, however, on Margarita Bellidiastriivi. Perfect 

 insects are often described over and over again, and it is not 



1868. D 



