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Plant insect - Lipaphis pseudobrassicae

Plant insect - Lipaphis pseudobrassicae
Austin, Travis/Bee Cave County, Texas, USA
April 20, 2011
This insect was found on a Bracted twist-flower (Streptanthus bracteatus)in the garden. I first noticed it two days ago and it is there all the time.

Moved from Aphids.

Looks like Lipaphis erysimi.

Moved for expert attention
Moved from ID Request.

Aphids of some kind. You've identified the host plant, so further ID may be possible. Let's see what the experts have to say.