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Photo#1006599
Caterpillar - Macremphytus tarsatus

Caterpillar - Macremphytus tarsatus
Morton Arboretum-Schulenberg Prairie, DuPage County, Illinois, USA
October 7, 2014
Size: 1-1/4 inch
Brighter yellow underside than photo shows. Found on dogwood.

Moved

Moved
Moved from ID Request.

Dogwood Sawfly
It is a Dogwood Sawfly larva, Macremphytus tarsatus.

One of the easiest ways to separate sawflies from caterpillars is the number of prolegs; caterpillars only having maybe 4-5 pairs, usually with a gap before the 3 pairs of true legs.
Sawfly larva also have prominent eyes, but this is hard to see with the dark head.

Larva / Adult

Looks rather to be a Sawfly larva
not a Lepidoptera

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