90 



Journal New York Entomological Society. fVoi. xxx. 



while and finally eats its way into the bud from the side. It remains 

 in the bud for five to seven days where it feeds (and undergoes its 

 first moult), during which time its presence may be externally detected 

 by the finding of its excrement among the leaves of the bud; and then 

 burrows its way down the center of the stem. The leaves which 

 compose the bud while the larva is within show signs of the feeding 

 of the larva when they grow out, some having irregularly frayed edges 

 while others are full of small holes. 



Fig. I. — Egg. X 28. 

 Fig. 2. — Smadl gall beginning to form just below the bud of goldenrod shoot. 



The second stage larva eats its way down the stem for a distance of 

 two to three inches. This distance determines the comparative posi- 

 tion of the gall on the rod when fully grown. Here it remains and 

 within a few days, after it has fed at one point by gnawing on the 

 interior of the stem, the gall begins to develop (Fig. 2). The contin- 

 ued feeding doubtless causes a stimulation of the plant tissues in the 

 vicinity of the larva, for the gall increases to a size on each species 

 of Solidago proportionate to the amount of feeding done by the larva. 

 Thus when the larva dies within the gall before becoming fully grown 

 (this happens frequently because of parasites), it has been observed 

 that the growth in size of the gall also ceases. Occasionally two larvae 



