Couplet 196

196a:  Head prognathous; pronotum expanded anteriorly, extending over head in retracted position (Phausis, Microphotus) or head retractile into tubular prothorax (Pterotus); distinctly to slightly dorsoventrally flattened; antenna with 9 or fewer antennomeres; some species, possibly all, bioluminescent; widespread (females)

Lampyridae  p. 423

196b:  Head hypognathous, not retractile into prothorax; body globular- cylindrical; antenna with 11 antennomeres; not bioluminescent,
Florida or near ports-of-entry (female Ripidiinae, North American females unknown)