Disholcaspis acetabula, new species

Host.--Quercus gambelii, grisea, toumeyi, reticulata [rugosa]

Gall.--Brownish-red hard bullet galls in clusters at base of small sprouts, hidden by debris. Individual galls are 6-9 mm in diameter, sessile, somewhat elongated, usually blunt, but sometimes pointed at apex. Surface finely wrinkled in preserved specimens. Interior of dense cellular tissue with a central thick-walled non-separable stony white larval cell. Exit hole in side. Occur in fall.

The normal emergence is probably in October

Distribution: CO, NM, AZ

Type locality. — Colorado Springs, Colorado, in the Garden of the Gods. The writer found old empty galls there June 30, 1915, and fresh galls not yet full grown. On November 14, 1918, Mr. J. H. Pollock collected these galls on a small oak at Palmer Park, but emergence was almost complete, as only one dead fly was found inside the galls. On August 24, 1919, he collected the galls from which the type flies were obtained and sent in as Hopkins U. S. No. 10781 i 1 . They were from Garden of the Gods and then contained pupae. Living flies were cut out of the galls on September 12 and October 3 and 7. The normal emergence is probably in October. The Division of Forest Insects has old galls collected at Manitou in January, 1914, by Mr. B. T. Harvey. The host species of this Colorado material is not determined. But the writer lias collected similar galls on Q. gambelii on the Sandia Mountains, New Mexico, at 2,933 meters (8,800 feet), and in Arizona at Flagstaff and Williams and in the Santa Catalina and Huachuca Mountains.

Note. — Similar galls have been seen on Quercus grisea Liebmann in Sandia Mountains, New Mexico, at Prescott, Arizona, and Alpine, Texas; on Q. toumeyi Sargent at Patagonia, Arizona; and on Q. reticulata Humboldt, Bonpland, and Kunth in Huachuca Mountains, Arizona.

Disholcaspis acetabula

Quercus toumeyi, reticulata [rugosa], gambelii, subturbinella [turbinella]
"Root" galls
Fig 4.