Phylloteras sigma

Quercus alba, muehlenbergii
Leaf galls, detachable
Flat, sessile, 6-7 mm long, on the under side of leaf near the edge in the fall. Rare.

[Photo caption]
On Q alba. Always on under side of leaf near the edge on saplings 8-10 ft high. Also on Q muehlenbergii. Galls drop in late Oct. An adult was found alive in cage on Mar 7 the second spring.

Phylloteras sigma, new species

Host.--Quercus alba

Gall (pl. 2, fig. 22). — Sessile on underside of leaf near edge in the fall. Fusiform, flattened, the ends slightly curved in reverse directions, up to 4 mm. long by 2 mm. wide, with the larval cell in a depression in the center. It starts to develop late in June. Kare.

Habitat.—East Falls Church, Va., is the type locality. From galls collected October 22, 1940, a living adult was found in out-of-door breeding cage on March 7, 1942. Galls have been seen at Vienna, Va., and Cabin John, Md.; at Ithaca, Manorville (Crosby), and Nyack (Zabriskie), N. Y., and at Washington, D. C. (Pergande). Bassett collected galls in Connecticut.

Phylloteras sigma

Host: Quercus alba

Sigmoid-shaped galls on underside of leaves of Q alba

Distr: MD, NY, VA, DC