Callirhytis bipapillata

Quercus coccinea, ilicifolia
Leaf galls, integral
Isolated parenchyma thickenings in large numbers, projecting on both sides of the leaf in June. Rare on [Q coccinea]. Type host [Quercus ilicifolia].

[Photo caption]

267. On Q ilificolia. Also on Q coccinea (rare). Adults emerged June 30-July 5 (VA). Fig 317 for structure.

268. Parenchyma thickenings in numbers on leaf of Q ilicifolia projecting on both sides of the leaf in June.

Callirhytis bipapillata, new species

Host.-- Quercus ilicifolia

Gall (pl. 1, fig. 8 ; pi. 2, fig. 20) . — Leaf parenchyma galls, not detachable, not confluent, on several leaves derived from the same leaf bud and as many as 200 or 300 on a leaf. Individual galls are ellipsoidal, 1.2 mm. high, projecting equally on upper and lower surfaces of the leaf, 0.8-0.9 mm. in diameter, bare above, pubescent below. Exit hole on upper surface.

Habitat. — Type material was collected on July 5, 1930, and June 27, 1933, at elevation of 2,000 feet on the trail to Signal Knob at north end of Three Top Mountain southeast of Strasburg, Va. Adults issued June 30-July 8. Galls were seen also 3 miles northwest of Vienna, Va. Prof. C. E. Crosby collected old galls at Kiverhead, N. Y., in September 1913.