Biorhiza rubinus n. sp.

Quercus alba

Galls: When the leaves begin to turn in October, subglobular juicy galls about two or three mm in diameter and rosy in color are found attached to the under side of the leaves. From a number of these galls collected in October 1887, four were selected and opened October 15 1888, from which one fully developed female cynip and three plump white larvae were obtained.

Biorhiza rubina

Spherical but depressed, pure white, bare, 3-4 mm in diameter. On under side of leaf of Q alba in the fall, dropping before the leaf. Adult probably emerges the second spring.

Phylloteras rubinum

Quercus alba, prinus [montana]
Leaf galls, detachable
Depressed sphere up to 5.2 mm by 3.1 mm high, on under side as leaves are turning in the fall, often on young trees.

[Photo caption]
A depressed white sphere up to 5.2 mm in dia by 3.1 mm high on under side of leaf of Q alba just as the leaves are turning in the fall.

Biorhiza rubina

White or rosy translucent depressed spherical galls 2-3 mm in diameter on under side of leaves of Quercus alba in fall, agreeing with the original description of the galls of this species, have been noted [in IL, MO, NY, VA]. Similar galls have been seen on the rock chestnut oak, Q montana, [in VA]. The writer has not reared the adult.

Biorhiza rubina

Globose, rosy, juicy leaf galls on the upper surface, diameter 2 to 3 mm, on Q alba.

Phylloteras rubinum

Host: Quercus alba

Depressed, spherical galls (2-3 mm) on underside of leaves of Q alba

Distr: IL, MO, NY, VA

Biorhiza rubinus

The galls are small, globular, juicy bodies from two to three inches [original description says mm] in diameter, occurring upon the leaves of Q alba in October. Flies emerge the following summer. MI, IO