Amphibolips ilicifoliae

Quercus ilicifolia
Leaf galls, integral
Spindle-shaped, up to 35 by 15 mm, attached to upper surface of leaf. June.

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192. On Q ilicifolia. Adults emerged June 23-25 (VA); July (NY). Heavily parasitized.

Cynips quercus ilicifoliae n. sp.

Quercus ilicifolia. Elongated, fusiform galls growing on the upper side of the leaves of Q. ilicifolia, and standing erect, or nearly so — sometimes entirely preventing the development of the leaf, and apparently growing out of the petiole. The central nucleus containing the larvae, is kept in place by radiating woody fibres as in C. q. inanis 0. S. The largest galls are two inches in length and seven-eighths of an inch in diameter ; average size about one and three-fourths inches long, and three-fourths in diameter. Apex rather longer and more slender than the basal portion, and often considerably curved.

These galls are of the same dark green as the leaves. Many are found very much smaller than those described above, but they produce parasitic flies. Baron Osten Sacken writes me that he met with numbers of these galls in Pennsylvania several years ago. They are rather rare here (Conn.)

Amphibolips ilicifoliae

Elongate, fusiform, dark green leaf gall, usually arising from the petiole, internally an ovate, fiber-supported cell, length 25 to 55 mm, diameter 7 to 20 mm, on the upper leaf surface of Q nana [ilicifolia].

Amphibolips ilicifoliae

Cynips quercus ilicifoliae
Cynips ilicifoliae

Gall. On the upper side of the leaves of scrub oak (Quercus nana [ilicifolia]), standing erect or nearly so, sometimes entirely preventing the development of the leaf and apparently growing out of the petiole. Dark green, elongated, fusiform with the apex rather longer and more slender than the basal portion, and often curved. The outer shell is thin, smooth, and opaque. Internally with a larval cell held in position by radiating fibers as in Amphibolips inanis. Length 25 to 55 mm; width 7 to 20 mm.

Habitat: CT, NY, NJ, PA, DE, MD

Galls may be found in May and June and the adults emerge during the latter month.