3. Ventral swelling of S1 without setae. Fore wing with vein 2/Rs basad vein 2m-cu; apex clear. Exposed part of labrum about 0.3x as long as wide.
1. Yezoceryx rupinsulensis
2. Yezoceryx rupinsulensis
3. Yezoceryx rupinsulensis
3’. Ventral swelling of S1 with numerous long setae. Fore wing with vein 2/Rs opposite or distad vein 2m-cu; apex with dark spot. Exposed part of labrum 0.5-0.6x as long as wide.
1. Arotes melleus
2. Spilopteron franclemonti
3. Spilopteron vicinum
4. Arotes melleus
future couplets
4. Hind tarsal claws with small acc...
...
Arotes
4’. Hind tarsal claws without acces...
...
Spilopteron
