Neuroterus virgens

Quercus arizonica, gambelii, subturbinella [turbinella]
Stem galls
Stem swellings or cells under bark
Fig. 42. Cells hidden in wood under bark. Twig slightly swollen.

Neuroterus rileyi variety virgens Gillette
agamic form

Neuroterus virgens

GALL. — Probably as described for the species; the types small, with only a slight swelling. On twigs of Quercus Gambelii.

RANGE. — Colorado: Manitou (Gillette).

Gillette’s insects were all females, not males as Beutenmuller stated. They were reared between May 8 and 13. The host was not recorded, but was probably Q. Gambelii, the common oak of the region. I have not seen material certainly known to be types, but I have seen material from the U.S. National Museum collected by Baker and determined by Baker; Mr. Weld says that these insects agree with the type of virgens. This is the only record of a variety of rileyi occurring on other than chestnut oaks, and the only record of the species west of the 100th meridian. This may suggest that the species occurs on white oaks of several groups and that it is transcontinental.