Holcaspis persimilis, new species

A small, hard, globular gall, occurring on the twigs of the black oak and very similar in structure to other Holcaspid galls. It is, however, smaller, less than 7 mm. in diameter, and exteriorly it is very rough or rugose, with irregular raised lines and ridges.

Described from a single specimen, labeled simply: "Black-jack oak, issued November 10, 1868."

Holcaspis persimilis Ashmead

Gall. (Plate VIII, Figs. 15, 16.) On the twigs of black jack oak (Quercus marylandica). Rounded, hard, rugose externally, with raised lines and ridges. Otherwise similar in structure to other Holcaspid galls. Diameter 7 mm.

This species is unknown to me. The types of the single adult and gall are in the United States National Museum; the habitat is unknown. According to Ashmead the adult may be known from the congeners by the angulated outer vein of the areolet.