Dark Gray in ground caterpillar? with black diamond pattern

Hillside, NJ

Hi - digging in garden plot superficial, not deep. One inch big. Healthy, dark gray, looks like leather! Black diamond pattern down back. No other telling details (horns, dots, stripes, feet). any idea?
thanks

Magnolia, TX(Zone 9a)

Any pix?

Contra Costa County, CA(Zone 9b)

diamond back.... uh.... rattle snake-caterpillar?

Perhaps search a site with Lepidoptera of New Jersey in the title.

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