For several years the invasive, voracious insects have caused costly damage to fruit trees, some hardwoods and vineyards in Pennsylvania and New Jersey.
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Now people say they started showing up near 18th and Arch several days ago.
Of the scores of spotted lanternflies we found none of them seem to be interested in nearby street trees.
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Instead, the Center City dwellers remained on pavements and walls. Many were alive and moving, even hopping.
Some were smashed dead, and not by accident.
"The state of Pennsylvania has been doing a really good job letting us know the spotted lanternfly is not our friend," said office worker Dena Driscoll.
The state says if you see a spotted lanternfly you should take action.
For Driscoll and others we met on Tuesday, action means using their shoes to kill the bugs.
For more information, and to report spotted lanternflies in Pennsylvania, visit this state website.