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Photo#108097
What are we?

What are we?
Herring Run Park, Baltimore City County, Maryland, USA
May 7, 2007

Images of this individual: tag all
What are we? What are we?

Tenthredinoidea
possibly Tenthredinidae, Nematini

Moved

Sawfly larvae.
Knowing the tree species could help greatly here.

 
Populus spp.
It is a Cottonwood, I believe.

 
Agree with cottonwood
On the second photo, note the gland-tipped, rounded teeth on the intact leaf margin in the extreme upper right part of image; compare to this (more easily perceived on the high-resolution version). Populus deltoides.

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