THE PITCH-PINE TWIG TORTRIX. 743 



mine when the resin was cut into. A ring of strong spines surrounded 

 the posterior border of each segment and enabled them to move about 



Fig. 259. — Retinia comstockiana Fernald, larva, pupa, adult 

 and work. — From Conistock. 



in the mine with considerable rapidity. From other lumps the empty 

 pupa skin was protruding for half its length, the pupa having worked 

 itself to that position before giving forth the moth. 



Some of the burrows examined extended in both directions from the 

 point of entrance. Occasionally, also, the twig at the point where the 

 resin exuded was completely girdled, and in other cases eaten out to 

 such an extent that a very slight force would suffice to break it off. The 

 larvae were in some cases found with their heads at the mouth of the 

 burrow, but in the majority of instances the opposite was the case. 



The moth which issues from the burrows is quite small and soberly 

 colored. In the figure it is represented natural size; the darker shades 

 are dark rust color, and the lighter light gray. It belongs to the family 

 Tortricidae, the larvae of which are usually leaf-rollers. 



