I didn't realize that spider mites would attack the TOP only of the leaves? Katkin - They've been at this for a month or more. I don't remember what they looked like the last couple years when the leaves got ready to drop. The other plumie (in a different area) is blooming its plumie heart out! Weird stuff this is. Thanks, Terri

I am sure there are raccoon, possum & rat roaming around in our back yard at night but why just the same Plumeria and not the other ones. We have close to 10 Plumeria in our yard.

That appears to be thrip or mite damage. The plants should recover from it rather quickly. It sounds like you figured it out on your own but just didn't know the best approach to get rid of the crawling "brown thingies." Look for a Neem oil or a 3 in 1 type product to treat all surfaces of the plant including undersides of leaves. edit: forgot to add... this time of year you should expect leaves to yellow and fall off as the plant prepares for a dormancy period. Generally speaking the oldest leaves (or sometimes the most damaged leaves) yellow first.

I agree with the recommended neem or similar treatment - I would guess you have thrips or spider mite type critters - leaf deformation of that type is typical of sucking insect damage so that would be where I would start as well. Keep out of sun after treatment for at least a day or they will scorch.