See attached file
Thank you for this report and these pictures. I consulted with our forest health specialist at the N. H. Division of Forests and Lands and we agree the damage pictured is from hemlock needle miner and not hemlock woolly adelgid or elongate hemlock scale.
Hemlock needle miner is a native insect and not considered a problem to the health of the tree. For more information about needle miner and other pests of hemlock: http://www.dec.ny.gov/docs/lands_forests_pdf/hemlockpests.pdf