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Hyles lineata
Looks to be late stage caterpillar. Black with longitudinal dorsal white strip, speckled sides of white and yellow speckles grouped together in bands, orange/gold and speckled eyes, head, feet and tail horn. 2.5 inches long
Grassy yard
Has a clasping tail end. Spit out green liquid when tail was pushed.
It is Hyles gallii. Here are some links to compare:
http://davesgarden.com/guides/bf/showima...
http://bugguide.net/node/view/35158/bgim...
http://bugguide.net/node/view/35157/bgim...
http://pick4.pick.uga.edu/mp/20q?search=...
Checked out the photos of the Bedstaw, close, this one is more orange than red and different speckles, but the head and the horned tail do look alike.