Callirhytis balanacea, new species
Host.--Quercus palustris
Gall.--A pip gall produced late in fall beside small acorns of the current season. Almost spherical, up to 6.3 mm in diameter, smooth, bare, green with a small black papilla at apex, secreting honeydew. Full grown and dropping off during October after which a thin, fleshy outside layer soon turns black, wrinkles, and dries down on the hard inner shell, 3.5 by 4 mm, within which is a thick nutritive layer containing the larval cavity.
Biology.--Galls were collected in October 1930. During October 1931 most of the larvae transformed into adults, which remained within the galls on the ground during the winter and emerged March 26 to April 2, 1932. A few larvae hung over and adults emerged on April 1, 1933. From galls collected in October 1931 adults emerged March 14-28, 1933. October 1935 galls gave adults on March 28, 1937. On March 20 and April 1, 1940, adults emerged from galls collected in October 1938. One was captured at Mount Vernon, Va., on March 21, 1915, by W. L. McAtee.
Habitat. — The type material was collected from two trees at East Falls Church, Va. Galls were seen at Waterford and Bluemont, Va., and at Poplar Bluff, Mo. William Beutenmueller collected galls in Woodlawn Cemetery, New York City, but failed to rear adults.
