This is yet another genus that appears to be composed of a few species that may not be congeneric. In my collection I have both species that are supposed to occur in North America, C. eriophori and C. viburnicola, but the former species is far more common.
Ceruraphis eriophori (Walker)
I see this species here and there in many habitats from the wet mild Willamette Valley of Oregon to cold dry habitat of southern Idaho. It apparently migrates between Viburnum and various Cyperaceae that I usually lump under “sedge” in my collection (should have joined that intensive sedge identification seminar!). Interestingly, I found apterous viviparae on “sedge” as late as 26 November in southern Idaho. Like many aphids, this species seems to hedge its bets in a way by keeping viviparous females on the secondary hosts just as long as possible into fall.