Comparison with Robin McLeod's photo, identified as Loxomorpha flavidissimalis. Similarities I see:
a-banding pattern on forelegs looks similar
b-AM line--similar, though my specimen is worn
c-PM line--very similar, note the double line towards margin (discal spot, as in description below)
d-PM line takes a deep jog and then continues to margin, as in description, though there is wear on my photo
(d)-note no subterminal line on either photo, as in description below
e-leading edge of forewing has pleated smooth area
f-abdomen has similar weak banding pattern; antennae are similar
g-brown spot on top (frons?) of head--hard to see, because the photos are from slightly different angles, but it is there on both
(My specimen shows a prominent brown tuft ahead of that, and I do not really see it on Robin's photo.)
I'm certainly not an expert, but they look very, very close to me. Comments appreciated.
Direct link to full size image for non-editors.

Description of Loxomorpha flav. (by Robin McLeod) from guide page:
Adult:
-forewing bright yellow with faint grayish AM and PM lines; discal spot a grayish patch, semi-hollow; PM line jogs abruptly near middle, forming a deep U-shaped sinus, then curves distally again before reaching inner margin; AM line irregular, not straight; no subterminal line;
-hindwing similarly colored except slightly paler near base; PM line very faint, shaped the same as on forewing; no AM line, discal spot, or subterminal line

Tricky, tricky.