THE PITCH-PINE TWIG TORTRIX. 
743 
mine when the resin was cut into. A riug 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 Comstock. 
in the mine with considerable rapidity. From other lumps the empty 
pupa skiu 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. 
