DISHOLCASPIS TERRESTRIS, new species.

Plate 28, fig. 3.

Host. — Quercus stellata Wangenheim and Quercus margaretta Ashe.

Gall. — Globular bullet galls up to 17 mm. in diameter in clusters on runner sprouts or sprouts from stumps at surface of ground hidden by loose debris. When fresh finely mottled with red, but when dry almost uniformly red and finely wrinkled. Inside is a distinct thin- walled central cell in the center of spongy brown tissue.

Type locality. — Ironton, Missouri. Type galls collected on Q. stellata, October 5, 1917, when a few of best developed contained adults and the rest pupae. The flies issued in breeding cage out of doors at Evanston, Illinois, November 6, November 11, and December 1, 1917, and living adults were also found in cage February 19 and March 11, 1918. Galls were also collected at Poplar Bluff, Missouri, October 8, 1917, and 18 flies were found alive in cage on December IS, the thermometer having registered — 14° F. on December 10. Collected galls at Webster Groves, Missouri, September 9, 1915, and cut out living adults November 2. Have collected these galls also at Hoxie, Hot Springs, and Texarkana, Arkansas; and at Palestine and Trinity, Texas; Dothan, Alabama; Marianna, Tallahassee and Madison, Florida — all on Q. stellata. In the United States National Museum are galls from Shovel Mount, Texas, collected by F. G. Schaupp on roots of post oak, with the label "Issued Febr. '97," but there are no flies with the galls. The same species occurs on runner sprouts of Q. margaretta. A large number of the galls containing pupae were collected at Ocala, Florida, October 30, 1919, and adults began to issue in the breeding cage in early December. Galls at Green Cove Springs, Florida, contained adults on November 23. Flies from galls on margaretta are a little smaller (average of 24 was 4.1 mm.) than those from stellata (average of 65 was 5.1 mm.).

D. terrestris Weld can also be found on Q alba.

Disholcaspis terrestris

Quercus margaretta
"Root" galls
Large bullet galls on runner shoots under larger trees in fall, galls up to 17 mm in dia.

Quercus stellata
"Root" galls
Large bullet galls in clusters of 2-5 on runner shoots under larger trees in fall, dia up to 17 mm.

[Photo caption]
On Q stellata. Also on Q margaretta. Adults were alive in out-of-door breeding cage on Dec 18, the thermometer having registered -14 F on Dec 10 (IL)