Moved from ID Request.

Something was bothering me about my preliminary ID as Agrius cingulata. I am now rather confident that this is a Lintneria spp., of which there are three species in Southern AZ: L. istar, L. separatus and L. smithi.

I can immediately rule out L.separatus as that species is known to have numerous red and orange patches of coloration. L. smithi and L. istar are more variable and both have darker morphs, similar to this individual. According to Tuttle, L. smithi can be distinguished from L. istar by orange coloration on the spiracles, while L. istar always has entirely black spiracles, like this individual.

The pronounced black area surrounding the first abdominal spiracle is a clear trait of Lintneria, as well as the short black caudal horn and the relatively small size overall (as evident by the hand in the picture). The clearest trait of Lintneria spp. larvae is the flattened thoracic segments which create an obvious hump. The position of this particular larva and the angle from which it was photographed distorts this trait and thus I didn't immediately recognize this as a Lintneria sp.

I think this is the pink spotted hawkmoth (Agrius cingulata), which is highly variable in its larval stage.

EDIT: See my above comment