City arborist sent my pic off to the Maine Forest Service, They are bark lice and are actually good for the tree, Here's the Entomoligist response,
Good to hear from you again, those are one of my favorite insects: bark lice, Cerastipsocus venosus. They are completely harmless and actually benefit the tree by consuming detritus and other organic bits found on the bark of trees, especially maples. Think of them as little herds of buffalo roaming and grazing, the ones with wings are adults and the ones with stripes are juveniles. They are indeed distantly related to the lice people get in their hair although distantly and pose no such problems for humans.
Cheers,
Tom Schmeelk
Entomologist 2
Department of Agriculture, Conservation and Forestry