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OK once someone calls Lonchaeidae trivial I have to post a reply. The larvae could well be Lonchaeidae although there will also be Dolichopodidae (Medetera) or Muscidae (Phaonia) in such situations. We can identify about 25 speciesof Lonchaeid larvae from mouth hooks but the best thing to do is to collect the larvae with some of the under bark material and breed them out. At 10mm and at this time of year they are likely to br 3rd instar so they should pupate within a week or two and probably emerge in May. Then you can tell what they are for sure