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Yes, Ingrid, usually only one stripe - but I cannot find another larva of Parasyrphus punctulatus as in the "Colour Guide to Hoverfly Larvae" from Graham Rotheray (sitting on spruce needle).
Steven Falk reports "Females have been observed laying eggs on spruce but it may predate aphids on both conifers and broadleaves as it can be found some distance from conifers" here: https://www.flick...044806699/
So I hope you will succeed in breeding Mr. Hyde from Dr. Jekyll - and I'm looking forward to it!

Eric