Key to species of Cornexcisia

1. Male [unknown for S. (C.) longicornuta]: phallus with juxtal arm arising proximo-ventrally, apically divided and partly covered in cuticular pile; lateral stylus bifurcated from base, with each branch elongate, gently curved and slightly expanded apically (Figs 1F, 3). Female [unknown for S. (C.) cygnocerca and S. (C.) suthep]: postpedicel about 6 times as long as pedicel (Fig. 2B).......................................................................... Sarcophaga (Cornexcisia) 2

- Male: phallus different. Female postpedicel at most 4 times as long as pedicel............. Sarcophaga (other subgenera)

2. Females [unknown for S. (C.) cygnocerca and S. (C.) suthep].................................................. 3

- Males [unknown for S. (C.) longicornuta].................................................................. 4

3. Postpedicel unmodified below insertion of arista...................................... Sarcophaga (C.) kurahashii

-. Postpedicel with a trough-shaped antero-proximal depression just below aristal insertion (Fan & Kano 2000: fig. 2)................................................................................... Sarcophaga (C.) longicornuta

4. Cercus long, not particularly broad in lateral view, bent anteriorly almost from middle and with tip gradually tapering (Fig. 1F); cerci diverging in posterior view; vesica membranous with a simple, tapering tip............. Sarcophaga (C.) kurahashii

- Cercus short, broad in lateral view, almost straight with tip gradually or abruptly tapering; cerci not particularly diverging in posterior view; vesica semi-sclerotized with a complex tip..................................................... 5

5. Cercus abruptly tapering in dorsal view, subapically with a dorsal knob, reminiscent of the beak of a mute swan; vesica with a distal knob; juxta undulating and without a sharp dorso-median crest (Xue et al. 2011: fig. 4; Fig. 3C)................................................................................................ Sarcophaga (C.) cygnocerca

- Cercus gradually tapering in dorsal view, without a dorsal knob; vesica with a median subapical thorn-like structure; juxta with a sharp dorso-median crest (Bänziger & Pape 2003: figs 7–10; Fig. 3B)................................ S. (C.) suthep