Podapion gallicola

Podapion gallicola n. sp.
A gall-like swelling of the two year old twigs of Pinus inops is not uncommon in the vicinity of Washington. 
The gall is either spherical or ovoid, rarely elongate, and varies from 1/4 to 3/4 inch in length. It is usually single but exceptionally there will be two and even three on the same twig and sometimes they coalesce. The surface is somewhat smother than the unaffected parts of the twig but concolorous; the interior is hard, woody, usually with an abundance of liquid resin. The larva or pupa of the Podapion may be found in the month of May in the center of the gall, completely surrounded with the resin, and in an irregular cavity which on one side extends to near the outer surface, probably to facilitate the exit of the imago which takes place late in May and early in June. One develops in each gall.
As the fresh galls are found only in spring and as the beetle would seem to be short lived, the probabilities are that the egg is laid in the one-year old wood in June, and that either the egg or the larva remains in the twig without producing the gal till during the short growing season the following year.

On a gall-making genus of Apioninae