European Sawfly
Neodiprion sertifer
Notes:

One year the bluebirds did not nest in the yard. The sawflies look back on that as a good year. They covered almost every branch of the red pine.

Normally though, they don't do much damage. I suspect the bluebirds and phoebes have something to do with that.

Photos:
It really boils down to this: that all life is interrelated. We are all caught in an inescapable network of mutuality, tied into a single garment of destiny. Whatever affects one destiny, affects all indirectly.
Martin Luther King, Jr.