Does this look like
http://davesgarden.com/guides/bf/go/808/
? they are really eating up my amaranth!
If I have the name right, I can add pic of grubs to BugFiles. The adults are hard to spot, they're ready to "flea" at the slightest disturbance. I finally got a look by shaking the plant over a large white bucket.
This seems the most likely diagnosis - see http://tinyurl.com/ns3obo for an image. Another leaf beetle, the striped cucumber beetle (Acalymma vittata) is somewhat similar - see http://tinyurl.com/kjczft, but lacks enlarged hind femora and the markings on the pronotum of the pigweed flea beetle (Disonycha glabrata).
Thanks! I have seen many (too many) striped cucumber beetles here. I agree this is not that.
