162 THE CANADIAN ENTOMOLOGIST. 



its gall before those of the other were completely formed. These were 

 observed as slight swellings or rings about the middle of July, and to grow 

 quite slowly, attaining full size by the beginning of September ; besides, 

 the Paedisca galls, as a rule, are in entirely different situations, as pointed 

 out in the previous paper referred to. The Gelechia galls are ordinarily 

 on tlie stem below the branches, and usually only one occurs on the same 

 plant ; the other forms them higher among the branches, or, as often hap- 

 pens, on the branches themselves. As many as eleven galls have been 

 counted on one plant. Likewise the differences of form, structure, 

 position and date of appearance between this gall and that of Trypeta 

 solidaginis, render it quite improbable that the one has any relation to the 

 other. There is no other known gall that could be suspected. 



I have again this summer observed larvae of this species of all sizes in 

 galls of corresponding sizes, from mere protuberances on the tender stems 

 up to the well formed characteristic galls. This, it seems to me, is direct 

 evidence of its gall-making habits. 



The following experiments have a tendency to confirm such belief. 

 Some Golden-rods, late in June, were planted in a bottomless pail sunk in 

 the earth of my garden and closely covered by a net of tarlatan ; some 

 days later several old galls containing living pupge were placed under the 

 net. Early in July moths were observed within. August 8th the net was 

 removed and several small yet unmistakable Paedisca galls were found on 

 the Golden-rods. September nth, the same are nearjy of the usual size 

 at maturity ; no larvae have appeared among the leaves at any date since 

 the cover was removed. August loth, I removed about a dozen of 

 different sizes from their galls to the leaves and flowers of the above men- 

 tioned isolated plants ; in a day or two all had disappeared except one 

 which was boring into the stem at the axil of a branch, and at the end of 

 a week it had caused a slight gall-Hke enlargement of the same. At 

 another time a number of larvae of different sizes were taken from their 

 galls and placed on leaves and flowers of their food-plant in a feeding 

 box ; they refused to feed, and after days of ceaseless effort to escape 

 died of starvation. Perhaps this result should have been expected, rather 

 than submission to so material a change of food and residence. 



After diligent search I have not found what I take for this larva feed- 

 ing on the leaves or flowers, and in but one instance have I found it in 

 any but its own gall, then in what was apparently an abandoned one of 



