This is a large genus of mostly tree-feeding aphids that live mostly on oaks, chestnuts, and related plants. There a re few species native to North America, one of which can be stunningly common in the forests of Washington, Oregon, and California where Quercus garryanna grows.
Tuberculatus (Tuberculoides) annulatus (Hartig)
This is a widespread and common aphid of the European oak Quercus robur (Blackman and Eastop). I have material from Oregon, Idaho, Colorado, New Brunswick, Germany, and the Czech Republic.
Tuberculatus (Pacificallis) pallidus (Davidson)
This is another of the aphids that I collected very early in my aphidology life, since it is so incredibly common on oaks in western Oregon where I lived. The first samples in my personal collection are from 1990, right after I started my Ph.D. program and when my older son was 5 months old. I have material of this species from Oregon, Washington, California, and Idaho.