Andricus furnaceus, new species

Gall. —A light grayish brown, rather regular swelling around small twigs, resembling a baked potato. Polythalamous, a single gall containing fifty or more larval cells. Matted, light brownish gray in color, resembling the skin of a baked potato, with scattered flakes or patches of loosened, dark brown, "burnt" skin. The whole interior is hard, compact-granular with very little solid woody fibre; the larval cells average 2.5 X 4.0 mm., formed of a layer distinct from but closely embedded in the surrounding tissue, the cells scattered irregularly throughout the gall, but more abundantly near the center. Surrounding and surmounting the young twigs (preventing their further growth) of Quercus sp.

Range: San Luis, Potosi