Found in Yew hedge when trimming. Frosty gray with black marks on back. (Washington Crossing PA USA)
Yes, it sure looks like the wheel bug nymph. The markings and orange antenna look like it. It is too young yet to see the “wheel” spokes on the thorax.
The nymphs and adults are great predators to have in the garden to get rid of caterpillars, aphids, etc.
They overwinter in the egg stage then emerge in spring to grow into the adults. There is just one generation per year.
As it grows it will molt a few times and turn into a large gray bug with a spiky looking ‘wheel’ on its backside behind the head. As it gets to be an adult, you would not want to pick it up as it reportedly bites with its long piercing sucking mouth parts.
CAUTION: The adult wheel bug is reported to inflict a very painful bite. It has been reported use of ammonia water or Epsom salts is helpful in relieving pain from the bite.