Gorgeous shots. do you have length? I would bet according to published accounts stretching back 100 years this is instead a P. laticollis larva especially given its location.
P. nigromaculata are a Florida, Deep south species, similar dots that peter out (I think) but smaller. The P. nigromaculata name comes from the dark mark on the males' pronotum, NOT the spotted larvae. We should add a P. laticollis section for these Phengodes because P. laticollis is very widespread and encountered more frequently, along with P. plumosa,in the east, especially outside of Florida. Remember ideally we have associations with males to ID to any species in Phengodes, and even then it is easy to be wrong, so little is known. I have encountered all the forms of P. laticollis many times associated with one another and feel pretty secure in this ID.

I've been trying to sort these out here and on iNaturalist.
I think the more sclerotized individuals are larvae (male or female). The images I find that are reliably identified as adult females are plump, pale and squishy. However I could be wrong.
It is my impression that larvae are found more frequently than adult females.
I've only found them myself a couple of times, so I am no expert.
ID to species seems to be difficult. The only keys I have seen are for adult males, and those require some detailed measurements. The whole group cries out for barcoding.
Any confirmation or correction of my ideas would be appreciated.

Edit. Here are a few images I suspect are adult females--very pale and squishy. They seem to be found mostly in spring. That would make sense, as males fly in spring.
(August!)
I think the more sclerotized ones (larvae of either sex?) are found at other seasons as well. Again, I am hypothesizing here.
It is too bad it is hard to get a good image of the eyes (compound in adult females) or the underside of the terminal segments (gonopore present in females).

Thanks for telling what to pay attention to. I did get a face closeup on mine, but honestly can't tell what's what there. Did I manage to get the eyes?
https://bugguide.net/node/view/582556

Unfortunately that's still the only one I've ever found. Hopefully some day I'll come across another!

I made comments there. I think you can see the simple eyes (ocelli/stemmata) at the base of the antennae. Methinks it is a larva, but I could be wrong.

Thank you so much for this description! :)

you're most helpful

v! Is mine the same kind?:

Thank you Ashley. They are amazing creatures.