I found several of these egg cases close together. Initially I thought this was an egg case of a Tussock moth (Lymantriidae), because some species in this group will lay their eggs on top of the coccoon and cover them with a white foamy secretion which hardens, as in this photo. However, thanks to PBaser, Bob B. it seems that this mass could instead by the egg case of a parasitic wasp.
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