Key to the species of Eucyphonia (based on Sakakibara 1968)

1. Coloration yellowish overall with dark spots..................................................... festiva sp. nov.

1’. Coloration brown or black overall........................................................................ 2

2. Pronotum brown or dark brown.......................................................................... 3

2’. Pronotum black with or without pale spots.................................................................. 4

3. Pronotum dark brown without spots; lateral branches of posterior process inflated, with diameter at the widest point approximately two thirds length of posterior medial spine................................... crassibullata (Sakakibara, 1968)

3’. Pronotum brown with yellow spots, lateral branches of the posterior process with diameter at widest point approximately one third length of posterior medial spine................................................ bifurcata (Sakakibara, 1968)

4. Pronotum without yellow spots; vertex with inferior borders yellow......................... furcata (Burmeister, 1833)

4’. Pronotum with yellow spots............................................................................. 5

5. Pronotum with large yellow spot on lateral margin, posterad of eyes...................... globigera (Sakakibara, 1968)

5’. Pronotum with several small spots........................................................................ 6

6. Pronotum with four yellow spots, two on each side behind supra-humeral processes; vertex with medium sized yellow spot....................................................................................... nasalis (Stål, 1862)

6’. Pronotum with more than four yellow spots................................................................. 7

7. Lateral branches of posterior process with anterior yellow spot............................. seabrai (Sakakibara, 1968)

7’. Lateral branches of posterior process without yellow spots..................................................... 8

8. Pronotum with two anterior spots, two at each side behind supra-humeral processes and dorsal one between supra-humeral processes; vertex with yellow spots on middle and lower edges............................ furcispina (Lethierry, 1890)

8’. Pronotum with spot at base of supra-humeral processes, one behind eyes extending over humeral angles, one behind each humeral processes and one at corner of lateral margin, vertex with inferior borders yellow........ mourei (Sakakibara, 1968)