This is small, apparently not well-understood genus, all species of which live on Salix (i.e. willows). There are a couple species known from North America.
Plocamaphis flocculosa (Weed)
As I travel around on work and pleasure, I often stop to look for aphids along roadsides, streams, and fields. As the years have gone by I more commonly think to myself, “The odds I find something new here are practically zero.” It was one of those days in 2013 that I stopped along a road and stream in central Oregon and pushed into the darkness of a willow thicket. There, to my surprise, was a great big aphid, covered in wax, with impossibly orange siphunculi. It is the only time I’ve seen it despite collecting avidly on willows for over 25 years.