Andricus foliosus, new species

Host. — Quercus bicolor and macrocarpa.

Gall (fig. 17). — A fleshy green enlargement of the midrib or one of lateral veins usually on basal third of leaf blade, usually only one on a leaf. "When seen from below there is a bend in midrib at this point and a small depressed spot. On upper side of leaf it shows a rosette of leaf-like rudiments hiding the gall; on the lower a smaller rosette on the concave side of the bond. The gall contains 1-6 larval cavities and the larva is much elongated like those in rose galls. The young galls begin to show about the middle of May when the young leaves are not one-third grown.

Habitat. — The type locality is a tree of Q. bicolor four miles west of Evanston, IL., out Emerson Street. Here the galls were observed year after year for several years. Galls collected June G, 1909, gave flies in numbers June 29 and in early July. In 1912 adults emerged June 20-28. In 1913 they emerged on June 26. In 1916 the flies were mostly out by June 28 and galls beginning to dry up. In 1917 they contained pupae on June 2-1. The paratype locality is a tree of Q. macrocarpa in Winnetka. IL. Miss Howe found galls at Ithaca and Geneva (see thesis) and the writer has seen them at Medina, N. Y.. as well as at Evanston and Moline, IL., on Q. macrocarpa.

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

Reference: https://www.biodiversitylibrary.org/page/7610734#page/344/mode/1up