Phylloxera foveata Shimer.

Dactylosphaera foveatum
Phylloxera forcata

This appears to be nearest related to Ph. foveola n. sp. and Ph. intermedia n. sp., though as no opportunity has offered to further study foveatum at Washington, Shimer' s original description is reproduced:

"On the same leaves [of Carya amara] containing the small galls, Nos. 7 [Ph. minimum Shimer] and 8 [Ph. c. -semen Walsh] , I observed a number of larger ones with a dimpled depression above (which may be caused by the collapse of the thin paper- like centre), an opening beneath by a rounded, downy orifice, and having a diameter of .06-. 33 inch [1.5 mm] and a vertical depth of .12-. 16 inch [3-4 mm] ; all contained the female and her eggs, and some larvae."

- Theo. Pergande: (1904) North American Phylloxerinae affecting hicoria (Carya) and other trees^©

Reference: https://www.biodiversitylibrary.org/item/114693#page/29/mode/1up