Great picture!
I don't know what it is for sure, terrene, other than some type of sphinx moth. It might be a white-lined sphinx or banded sphinx - here's a banded sphinx, top side -
{{gwi:452464}}
Sherry

First impression to me was Hyles gallii. Will look again after a cup or two of coffee... when I can see clearer (late night). LOL

Hi MissSherry! It's definitely not the one in your picture, it didn't have any bands and it has some coral/salmon type coloring on the top of the wings.

Not enough pink to be either a Eumorpha or Hyles lineata. I'm going ot say H. gallii.

http://www.silkmoths.bizland.com/hgallii.htm

Thanks guys! I think it is H. gallii. There is another photo of the top of the wings that I didn't post because it's kind of fuzzy, but from what you can see of the wings it looks just like the picture on the link. That is a great website! And it's a pretty moth. The caterpillar is so interesting-looking.

I wonder what they have used as a host plant here. Coincidentally, I started some Epilobium angustifolium from seed, but the plants are small because they're still in 16 oz cups waiting to be planted out. From what I understand this is an aggressive spreader and their bed isn't prepped yet.