Andricus peredurus, new species

Hosts: Quercus sp [Quercus potosina added as a placeholder based on range]

GALL.-A large, darkbrown, irregular, woody mass (Figs. 28and29) surrounding a small twig. Polythalamous, often containing fifty or more larval cells. The whole is formed of very many distinct but thoroughly fused masses, forming a rather spherical gall 8 mm. more or less in diameter; the surface is very rough, completely cracked as though it were burnt leather, the raised portions polygonal, averaging 2 mm. in diameter, dark, blackish brown, the separating lines being much lighter or yellowish.Internally the gall is composed of a dense, somewhat granular tissue which becomes more compact-woody close to the margin and immediately around the larval cells. The gall is quite too hard to cut through with a knife. The larval cells are about 3mm. in diameter, but elongate, and are closely surrounded by the woody tissue; they are scattered quite irregularly throughout the gall. Surrounding the young twigs of Quercus sp.

RANGE.-Mexico: San Luis, Potosi (Palmer Coll.).