Moved from Say's Mantidfly.

I'm seeing a broader mark at the back of the head (generally interrupted in D. sayi), very strongly-angled posterior margin of the pterostigma, smoother appearance of the pronotum, and the more squared cells of the forewing starting further toward the posterior of the wing (I can't reliably count "wishbones", but all of our Dicromantispa have the squared off cells beginning a bit more anterior).

Western specimens seem to have an additional point of confusion in that D. interrupta of the desert southwest that I've seen often have less noticeable pigmentation at the apex of the wing (with the broadened and darkened crossveins being more reliable).

Good find...assuming this is indeed Dicromantispa sayi, then it's a BugGuide first not just for Orange County, but for all California!

However, both Leptomantispa pulchella and D. sayi are recorded from CA, and they can be quite difficult to separate in photos. Moreover, L. pulchella is the more frequently encountered of the two in CA.

Also, note that, technically, the quote from Norm Penny states that L. pulchella is "usually" more brightly-colored...however there are darker forms of L. pulchella as well:

     

So it would be good if we could get further verification, to "totally" nail-down the ID if possible.

Rich, you mentioned Bob Allen sent a profile photo to Norm...might you or Bob still have such a photo and be able to post it here? (The photograph by Mark Singer you referred to appears to have been deleted.)

Even if (as is usually the case) a profile photo doesn't have enough detail to discern the diagnostic pattern of hairs on the pronotum, it may still help solidify the ID to see the edges of the pronotum (smooth vs. "rumply") and the wing-venation (hind-margin "wish-bones" ≤ 6 vs ≥ 8).

BTW, part of my interest stems from a desire to better ascertain just how far north in California D. sayi occurs. Your post here is the only putative CA representative I could currently find on the web (e.g. checking BugGuide, iNaturalist, Flickr). The range given in the literature for L. pulchella includes the Pacific coast region from British Columbia to California (as well as to the eastern US...and also south to Costa Rica). In contrast, D. sayi is listed in CA, AZ, NM, and points east...but not to the north of those states in the west (it does extend further north starting around the Great Plains). Just how far north D. sayi gets in CA isn't clear to me...it seems to be uncommon is southern CA, and may not make it much north of there.

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