Key to the species of male Fissocantharis with distinct longitudinal costae on red elytra

1. Antennomeres VII–IX each with a deep oblong excavation on dorsal side (SE China; Taiwan).......... F. pieli (Pic, 1937)

- Antennomeres VII–IX unlike above....................................................................... 2

2. Pronotum with lateral margins distinctly diverging posteriorly.................................................. 3

- Pronotum with lateral margins subparallel to each other....................................................... 4

3. Antennomeres VI–VIII each with a narrow longitudinal groove in middle of outer margin (Taiwan).... F. laticornis sp. nov.

- Antennomeres VI–X each with a narrow longitudinal groove near to outer margin (NE India)...... F. tryznai (Švihla, 2004)

4. Antennomeres VI–IX each with a shallow oblong depression on dorsal side (N Vietnam)............ F. c o o m a n i (Pic, 1926)

- Antennomeres V–XI each with a narrow longitudinal groove on dorsal side (N Vietnam)...... F. kontumensis Wittmer, 1989