Diplolepis acraspiformis, new species

Host. — Quercus undulata and Quercus toumeyi.

Gall (fig. 30). — Globular, spiny, single on under side of leaf on midrib in fall, monothalamous, 7-10 mm. in diameter. The wall of the gall is half a millimeter thick, hard and crystalline, covered with yellow spines 2.5 mm. long with swollen bases half a millimeter in diameter which are pinkish in color and polygonal by mutual pressure in cross-section. When detached a rosette of single-celled short colorless hairs is found about the base of each spine. The exit hole, 1.2 mm. in diameter is in the side of the gall. It is similar in structure to some of the Acraspis galls in the east.

Habitat . — The type is selected from galls collected November 7, 1921, in Blue Canyon west of Socorro, N. Mex., the files being cut out of the galls a few days later. Paratypes are from Nogal Canyon south of Socorro, the flies emerging December 31 and January 13. Other paratypes are from Hackberry, Ariz., the flies having emerged and died before February 14. All the above were on Q. undulata. One paratype is from Q, toumeyi, Patagonia, Ariz., the fly emerging December 31. Galls were seen on Q. undulata at Ashfork, Ariz., also and in the Burro Mountains, N. Mex.

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

Reference: https://www.biodiversitylibrary.org/page/7610635#page/282/mode/1up