Thank you for your report! No, not SLF, these are adults and larvae of fungus beetles. The larger beetle with orange markings on head and apex of wing covers is Aphorista laeta (family Endomychidae, the "Handsome fungus beetles"). The smaller dark beetles do not show enough detail in your images for identification, except that they are also adult beetles. The white grubs are fungus beetle larvae.

Tom Valente
March 12, 2026, 9:22 a.m.