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Sawfly - Cladius - male

Sawfly - Cladius - Male
Block Island, Washington County, Rhode Island, USA
July 9, 2020

Moved from ID Request.

Looks like...
If you check the info page for the Bristly Rose Slug, Cladius difformis, you will see that Dr. D.R. Smith maintains that "the two are distinct species, with C. pectinicornis being strictly Palaearctic." (Wow, 1799 was a long time ago!)
However, BOLD has some specimens of C. pectinicornis from both the east and west-coasts of NA. The info page has not been updated for 7 years though. I can't tell them apart in an image anyway.

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