Andricus biconicus, new species

Host.--Quercus stellata

Gall (fig. 13). — Cluster at base of petiole of leaf in autumn. The clusters consist of as many as 20 individual galls which are closely packed, the basal half of each more or less distorted by mutual pressure. The individual galls are spindle-shaped, with pyramidal base and conical apex, up to 8 mm. long by 5 mm. in diameter, brownish, covered with stellate hairs, dropping when mature. Monothalamous, consisting almost entirely of nutritive material in which a larval cavity is scarcely evident when the galls drop. When the larvae finish feeding the wall left is only about 0.2 mm. thick. Diameter of exit hole 1.2 mm. This is the gall described by Wells.

Habitat. — The types were reared from galls collected in fall and winter of 1919 at Denton, Tex., by R. L. Marquis. A gall opened on November 7, 1920, contained a pupa which transformed November 12 and adults issued (at Washington) before March 12, 1921.

Galls have been collected at Poplar Bluff and Ironton, Mo. ; Hoxie, Little Rock, Hot Sprin^rs, and Texarkana, Ark. : Palestine, Houston, Cuero, Boerne, College Station, and Arlington, Tex.; Tallahassee, Fla. ; East Falls Church, Va. ; Washington, D. C.

Andricus biconicus

Quercus stellata
Leaf galls, detachable
Cluster at base of petiole in fall, brown, covered with stellate hairs, dropping when mature.

[Photo caption]
On Q stellata. Adults emerged the 2nd spring Mar 5 and Feb 21 the third spring (DC)