CECIDOMYIA. \ 205 



the fertile aments of the hop, though larger, and connected with 

 the main stalk by a short pedicel which is inserted into one of the 

 lowest joints of the culm. From the coriaceous textnre of the 

 larva case, I suspect the inclosed worm will not leave it until trans- 

 formed to a pupa and upon the point of evolving the perfect fly." 

 It deserves to be noticed that Cecid. graminicola, discovered by 

 Kaltenbach (Winnertz, 1. c. p. 292), having precisely similar ha- 

 bits, forms an apparently analogous gall, likewise on a herbaceous 

 plant, Poa nemoralis. 



