The state Department of Agricultural Resources reports a dead spotted lanternfly turned up nestled in a poinsettia in a Boston home, part of a shipment of poinsettias from Pennsylvania, where the bugs have become a threat to a variety of native flora.
It was just one dead bug, and the bugs don't survive a hard frost, so the state isn't too concerned, yet, but is still asking everybody who got any sort of potted plant over Christmastime to examine them for the mostly gray bugs, roughly an inch long, covered in spots, with wings that are gray on top and red underneath.
If you do find one (or more), take a picture and report it to the state. And stick them in a container so a state inspector can take a look on a followup.
According to the Massachusetts Introduced Pests Outreach Blog, the bugs prefer to munch on ailanthus trees, but will eat other plants as well:
Spotted lanternfly is an invasive sap-feeding insect from Asia that was first found in the United States in 2014 in Pennsylvania. While the main host plant of this pest is tree-of-heaven (Ailanthus altissima), spotted lanternfly attacks a variety of trees, shrubs, and vines, and has the potential to impact a broad range of agricultural commodities, including apples, peaches, grapes/wine, maple syrup, as well as the ornamental nursery industry.