20 



tacking those buds that were highest up and nearest to the glass, 

 and that the larvae were only to be found in such buds as were 

 in close proximity to the glass, those situated lower down not 

 being at all affected, thus indicating that one rose-house may 

 become infested from another by adults, and not necessarily 

 from the introduction of infested plants. From the fact that 

 there are but few larvae present up to the month of May, but 

 that they increase in number during the summer and altogeth- 

 er disappear in late October, it would seem that they follow 

 very closely the habits of the British species. 



The eggs are deposited either in the unfolding leaf buds or 

 under the sepals of the blossom buds, the latter position seem- 

 ingly being preferred by the females where there is an oppor- 

 tunity for selection. In case the former is chosen, the eggs are 

 deftly inserted in the conduplicated leaves between what would, 

 later on, constitute the upper surfaces of the two halves of the 

 unfolded leaf. The maggots appear to fasten the edges togeth- 

 er with some viscous matter, thus forming a sort of pod within 

 which they attain their larval growth. If there are few larvae, 

 their effect is to cause more or less prominent swellings on what 

 would later become the lower surface of the leaf; if there are 

 many larvae in the leaf, it simply becomes distorted and discol- 

 ored and dies, leaving the affected parts as illustrated in Plate 

 III, a. In case of blossom buds, the effort of the female seems to 

 be to place her eggs as far under and near the base of the sepal 

 as possible, but there does not appear to be any regularity ei- 

 ther in their exact position ornumbers. Occasionally they will 

 be found stuck in the sutures separating the sepals. The ovi- 

 positor of the female is capable of great extension, and I have 

 observed it to be curved, coiled, and twisted in her efforts to 

 push it under the closely adhering sepal of a very young bud. 

 Frequently, after this has been accomplished she is unable to 

 extricate it, and dies attached to the bud. In one case I found 

 two females on a single bud, they having apparently perished 

 in this manner. Nevertheless, the females seem to be striking- 

 ly attached to their labor of ovipositing, as, in a propagating 



