Diplolepis aggregata, new species

Host.--Quercus arizonica, oblongifolia, toumeyi

Gall.--Globular oak apples, up to 35 mm in diameter, occurring in summer in clusters of sometimes as many as 12 on a twig at apex of previous season's growth. Each has an abrupt slender pedicel and usually only 2-4 galls in the cluster become well developed. The fresh galls are creamy white with a reddish blush on one side and spotted with numerous small red spots. Later they become yellowish and are often covered with a bluish bloom. The central cell is supported by a dense mass of fine silky radiating fibers and the wall is thick (0.7 mm), seven times as thick as that of the smaller unspotted leaf-gall apple of the same region, D bella.

Habitat.--AZ

- LH Weld: (1926) Field notes on gall-inhabiting cynipid wasps with descriptions of new species^©

Reference: https://www.biodiversitylibrary.org/page/7610635#page/283/mode/1up