From the Super Mario Wiki
Urban Stingbies are mosquito-like creatures found in the Metro Kingdom and Darker Side of Super Mario Odyssey. Though they are named after Stingbies, Urban Stingbies do not resemble them outside of their basic shape.
If Mario gets close to them in their larvae form, they transform into an Urban Stingby. They then charge at him in a straight line on sight, exploding when they hit Mario or an obstacle. Urban Stingbies are normally found in alleyways in New Donk City in their larval form during the mission The Scourge on the Skyscraper, and also appear in the Darker Side, where they are always found in their adult form. Urban Stingbies cannot be captured, but can be defeated by throwing Cappy at them or attacking them with a jump, which gives the player a coin. While in their larva form, they have no other means of offense beyond transforming, and can additionally be defeated by kicking them away before they transform.
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