32 IN MEMOIIIAM. 



hollow, or on some other substance, the larva forms a flat, 

 smooth, elongate-oval, yellowish- white, transparent, paper- 

 like cocoon, through which one can distinguish the uni- 

 colorous, greenish-white pupa. 



The perfect insect appears at the end of September, as a 

 second brood. (1841.) 



Gracilaria Fidella, Eeutti, Heyden (E. Z., 1862, p. 

 360). The larva feeds, at the end of August, on hop {Mu- 

 mulus Liqmlus), at first mining a pale spot in the fork between 

 two ribs of the leaf, afterwards beneath a piece of the edge 

 of the leaf, turned down towards the under side, and which 

 has more or less of a conical form. When full fed it quits 

 this habitation, and forms on the underside of that or some 

 neighbouring leaf an elongate-oval, paper-like, flat, shining, 

 white cocoon, with a faint longitudinal keel. In the first 

 half of September the imago is excluded, the pupa skin 

 being drawn half out of the cocoon. I found the larvae and 

 pupce this year, first at Freiburg in the Breisgau, on wild 

 hops; then, a httle later, at Speyer, on cultivated hops. 

 As far back as 1856, I had noticed at Badenweiler, in the 

 Black Forest, the empty cocoons on the hops in August; 

 hence there must be two broods. 



Reutti has well described this species, which has not been 

 mentioned by recent authors, in his Lepidopterous Fauna of 

 the Grand Duchy of Baden. Although Herr Reutti had 

 sent me this species in 1851, and I had then determined it 

 for him as a new species, I had so completely overlooked the 

 circumstance that I had already placed the specimens, bred 

 this year, in my collection as a new species, with the name 

 Gracilaria Humulella. 



It has afforded me much pleasure now to have discovered 



