OP is probably referring to one or more of the clearwings (Hemaris species). I assume the different varieties of bush-honeysuckle would be acceptable as host plants. I've had larvae on my Brandywine Viburnums (V. nudum). I just planted a couple Lil' Ditty Viburnums (V. cassinoides) last year, a variety that is supposed to only grow about 2' x 2'. There are other dwarf or compact viburnums if your space is limited.

Yes, I do mean the clearwings. Sorry for not being, well, clear!

I had wanted to add the diervilla to my garden anyway, so if they'll use that it will be fine. But I may look at the dwarf viburnums too, since I have a space I can tuck a couple if they really are that tiny. The more the merrier if it means I get to see more of the moths around the garden.

I know the clearwings also use dogbanes for host plants. Some think they are weedy, but I think they are beautiful. They are the plant family the milkweeds evolved from. They have the same toxins as milkweeds but Monarch cats won't eat them. I don't know why. I put the question to Anurag the Monarch and Milkweed professor, but haven't heard back yet. I'm sowing seeds for it. Have extras to share.

I've never seen one here in Miami FL.

The clearwings also use Triosteum species. They are in the honeysuckle family. The Diervilla is a good one also. I'm getting some of those myself.

Found this hummingbird moth caterpillar yesterday (October 11) feeding on Lil' Ditty Viburnum.