Stigmella plagicolella, the "tadpole mine" on Blackthorn, Prunus spinosa, along the Access Trail. Frass filled trail suddenly expanding into a blotch mine, usually filled with dispersed granular frass. Larva is yellowish [with a brown head?]. The mine seasons are supposedly July [+ earlier?] and September - October.
About 8 mines found by the time I got to the Red Pond, at least 3 of them with moving caterpillars inside.
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