Fantastic! I knew that it wasn't something that had been documented before. I suppose it is most likely to be an introduction from the Neotropics?

...based on Dr. Oswald's ID below. But if that's not the case let me know and I'll move it to Mantispidae.

...but I'm pretty sure it's Mantispinae and certain it's Mantispidae.

I'm a bit rusty on all the taxonomic subtleties of Dicromantispa and its relation to similar-looking taxa, but I'd hazard to say this would probably be best placed as robust individual of D. sayi (perhaps a gravid female) based on "current" circumscriptions (i.e. presuming things haven't changed since I studied the situation in 2013).

Note that D. sayi is a variable species, with at least two color forms...for details see "Identification" and "Remarks" headings on this BugGuide info page. So it's not clear what the notion a "typical D. sayi", in the vernacular sense, would be. But the brown & yellow color and large number of "wishbones" here seem quite compatible with the southern form of D. sayi...as does the (vaguely) 3-banded antennae (better seen in 2nd photo).

And, just to be clear, the "wishbones" characters is something I proposed in the remarks & comments here...and while the idea may be useful, I don't know whether formal mantispid taxonomists would fully embrace them. ;-) Wishbones can be difficult to count without a clear transverse view of a single fore-wing edge (overlap can often make it hard to clearly discern relevant "wishbones" from the morass of other veins when two wings are held closely together). Also, wishbones get smaller and smaller towards the wing apex, and it can get difficult to decide what constitutes a "bonafide wishbone" (i.e. because the forked portion can become quite small). Sometimes the distal-most wishbones (near the wing-tip) are separated by a(n unforked) linear vein reaching the margin, so I (somewhat arbitrarily) adopted a convention of including only consecutive wishbones in my counts.

But in this post the 2nd photo gives a good view, and like Russell, I too count at least 12. There's some ambiguity here as to how many more than 12 there are here, since the "13th wishbone" (I count starting from wing base to tip) is very small, and arguably nested in a larger "14th wishbone".

Finally, I don't know whether the neck shape & length here is diagnostic of something different...they look within range of variation to my eye. (Good old variation...the bane of dreams for a "tidy" taxonomy! ;-)