>>Nice snakes. What's interesting to me is that porphyracea that I kept 7 or so years ago that were sold to me as "vaillanti" don't really look like the animals you have. Do your adults also have the very dark banding? My "vaillanti" had very light transluscent-type banding so that the striping could be seen through it. A photo is below. Perhaps mine were really "nigrofasciata"?
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David, they are both likely to be Chinese porphyracea in the "nigrofasciata" group. The subspecies name has only recently been changed to vaillanti, and I understand that most of the nigrofasciata have been moved to vaillanti. Also, as Steve will probably tell you, the babies have more color/contrast than the adults, which may appear more faded. On top of that, there is a lot of variability in the nigrofasciata/vaillanti group. I assume that the porphyracea vary similarly to the mandarina that occupy a similar range from N. Vietnam through s. China. Hope this helps a little.
TC