- Mandibular masticatory margins oppose at full closure but do not overlap
- Eye at extreme posterior apex of deep antennal scrobe
- Antennal sockets and frontal lobes strongly migrated laterally, far apart and close to lateral margins of head
- Abdominal segment IV with complete tergosternal fusion
- Sternite of abdominal segment IV reduced, tergite much larger than sternite and strongly vaulted
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