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Photo#270012
Aphid

Aphid
Norfolk, Virginia, USA
April 26, 2009
Size: ~0.50mm (or less)
Host plant some type of maple or sweet gum tree.

Hmm...
Do you have a shot that shows the leaves? Someone who's used to looking at leaves under microscopes could probably distinguish maple from sweetgum based on those crazy squiggly hairs, but it's beyond me!

 
maple versus sweetgum
I checked several descriptions for both genera: Acer (maples, several species) and Liquidambar (sweetgum, only L. styraciflua). Hairiness of the underside of the leaves is mentioned for several species of maple, but not for sweetgum (except some mention of hairs in the axils of veins). So going on that criterion alone, it would seem that your specimen is more likely to be a maple.

 
It was a small...
maple tree, but I don't know what kind. I was in that area a couple of weeks ago.

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