Hyles lineata
That particular bugger comes in a lot of different patterns though according to some expert ass hat I found on the net:
"Probably the most common request I get for Spingidae larva identification, especially in the western and midwestern states is Hyles lineata or the white-lined sphinx. Many people find this caterpillar, which is highly variable in patterning, in their gardens feeding on a great diversity of plants including willow weed (Epilobium), four o'clock (Mirabilis), evening primrose (Oenothera), tomato (Lycopersicon), purslane (Portulaca), and Fuschia."
