Diplolepis cinereae

Hemispherical sessile blister

Hemispherical, slightly elongated, sessile by its flat face on the lower side of leaf of Q rubra in spring. Greatest diameter 6 mm, wall very thin, green, veiny and translucent. Flies emerge about the last of May.

Dryocosmus cinereae

Quercus catesbaei [laevis], coccinea, falcata, ilicifolia, imbricaria, marilandica, myrtifolia, rubra, texana [buckleyi], velutina
Leaf galls, integral
Hemispherical, thin-walled, with a free-rolling cell inside, sessile on under side of leaf in May-June.

[Photo caption]

183. On Q rubra. On all the red oaks. Adults emerged May 14 (DC); May 27 (IL).

DIPLOLEPIS CINEREAE (Ashmead)

Dryophanta cinereae

Andricus (Callirhytis) saccularius

Cinereae was described as a rare species on Quercus cinerea at Jacksonville, Fla. ; saccularius from Q. coccinea and velutina in Connecticut. They seem to the writer to be the same. The galls have been noticed on the following oaks also: Q. rubra, imbricaria, marilandica, and phellos, and at the following localities : Evanston, Glencoe, Ravinia, Fort Sheridan, Waukegan, Palos Park, and Moline, IL.; North East, Pa.; East Hampton (C. R. Crosby) and Medina, N. Y.; Plummer Island, Md.; Washington, D. C; Rosslyn and Waterford, Va.; Poplar Bluff, Mo.; Trinity, Tex.; Fairfax, S. C. ; and Jacksonville, Gainesville, and Ocala, Fla.

Flies were emerging at Waukegan from galls on red oak, Q. maxima on May 27, 1911. The National Museum has a fly from Washington that emerged May 19, 1918.

Dryophanta cinereae

Subglobose, greenish gray, somewhat longitudinally ribbed, rugose, sessile galls; internally, with a loose kernal, diameter 4 mm, height 3.25 mm, on Q cinerea [incana]

Andricus (Callirhytis) saccularius n. sp.

Small, hemispherical, pouch-like galls, attached by their full diameter to the underside of the leaves of Q. coccinea, the largest not more than three-sixteenths of an inch through. An ordinary ring net for catching insects will give a good idea of the form of this gall as seen on the underside of the leaf. The flat upper surface is formed of the upper lamina of the leaf and is sometimes slightly depressed below and rarely raised above the general surface of the leaf It appears on this side as a circular scar whose outline equals the diameter of the gall. The gall walls are green like the leaf, and extremely thin, and in each there is a free, oval larval cell like that of A. pusulatoides described in this paper, except that it is a short oval, while the other is very long. I was inclined to consider these two as identical, but an examination of the only fly, a male, that I have reared from these galls ; their shape, and the larval cell, and the position of the galls on the leaves show it to be a distinct species. I have a number of the galls, and each contains the empty larval cell, showing that my specimens were gathered too late.

One male specimen from Connecticut.

Dryophanta cinereae

Diplolepis cinereae

Gall: On the under side of the leaves of upland willow oak (Quercus brevifolia=cinerea [incana]) in April and May. Monothalamous. Greenish gray, somewhat longitudinally ribbed and rugose. Hemispherical or bag-shaped, thin-shelled, containing a loose kernel which rolls around freely. On the upper side the gall is indicated by a slight discoloration of the leaf. Diameter at base, 4 mm; height 3.25 mm.

Habitat: FL

The gall of D cinereae is practically the same as that of Callirhytis saccularia and it is possible that the latter species will prove to be a synonym of D cinerea.

Dryophanta cinereae n. sp.

Quercus cinerea [incana]

(The Upland-willow Oak Spangle Gall.)

Galls. — Small, semispherical galls, sessile on the under surface of the leaves; internally there is a loose kernel which moves freely about.

While the fly of this species might easily be confounded with those of the others, the gall easily separates it; it does not project above the upper surface of the leaf as do the other species. Very rare.