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Caterpillar - Eumorpha achemon

Caterpillar - Eumorpha achemon
North Platte, Lincoln County, Nebraska, USA
August 13, 2011
Size: 2 3/4 inches
Found in the morning on a hibiscus plant.

Moved from ID Request.

Looks like
Eumorpha achemon - Achemon Sphinx - Hodges#7861

sphinx caterpillar
likely one of the sphinx moth caterpillars...

or possibly, but the dots on the side dont look quite the same.

An expert will clear it up, but in the meantime, here are links to the whole group:

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