Moved from Ceanothia.

A sexually dimorphic species, with females much lighter. This female:

shares some similarities with C. boharti, but the silhouette of the female genitalia in this pic on flickr (being careful to account for the the darkened apices of the hindwings) suggests that the most parsimonious answer is true, and that it is also C. bicolor, though I say this with less confidence. Both bicolor and boharti occur on Ceanothus cuneatus, and the life history of bicolor is indeed as you have observed, with the nymphs inducing leaf-folding and producing copious wax. The life history of boharti is unknown, but should not be assumed to be the same: nymphs of one Ceanothia spp., for example, feed on the branches below ground near the region of root-attachment. Jensen also notes that he, like you, found these on the same plants as E. minuta, and noted that adults emerged in large numbers in late May.

Moved from Euglyptoneura fuscipennis.

Unhappy with some noticeable differences between this psyllid and your other E. fuscipennis images, I decided to exhaustively review all of the Euglyptoneura images you've uploaded to flickr while comparing key characters to Heslop-Harrison's original descriptions of the genus. My initial observation was that most specimens in the series were fairly consistent among characters, except for the two reared from leaf-folding nymphs; those psyllids seemed to differ slightly in the wing venation, wing maculation, the appearance of the genal cones, and some other difficult-to-quantify characters. Once I started comparing the pterostigma of each, I finally made a breakthrough:

Euglyptoneura, while appearing to have a pterostigma from afar, is defined as actually lacking one as it lacks an associated costal nodal break. The presence of the costal nodal break is what seperates Ceanothia from Euglyptoneura. As your images are such a high quality, I was easily able to review the pterostigmatic area in all of your Euglyptoneura and what I found is that while most of them lack a costal nodal break and are therefore correctly placed, both of the psyllids reared from leaf-folding nymphs actually did have this trait. Therefore, both this psyllid as well as this one:

actually belong to the elusive genus Ceanothia, which turned out to be under our nose the whole time.

Using two of your psyllids, I did a quick graphic to illustrate this feature (I also point out the cubito-medial petiole, which is a more variable character but it's often a very useful way to spot Euglyptoneura). Click to enlarge:

Knowing this, we shouldn't have any trouble distinguishing these anymore.

As to which species these both belong, this one appears to be a male C. bicolor, and I would reason that the female is the same species (the adult males are much darker overall than the females). The nymphs do indeed induce leaf-folding on Ceanothus cuneatus. The most similar species is C. boharti; I will compare the two later and hopefully get a definitive name.

Thanks for your patience - only took about a month to sort these out! I believe that makes this 5 Ceanothus species that you've photographed so far - quite impressive!

Moved from Euglyptoneura.