- Orifices of abdominal spiracles IV-VII directed posteriorly
- Pygidium small or very small, usually merely a narrow U-shaped sclerite
- Male with sharply defined presclerites on abdominal segments IV-VII; abdominal sternite VII hypertrophied; abdominal sternite VIII internalized and bilobate apically
- Male biaculeate hypopygium mostly or entirely exposed
- Basal ring of male genital capsule hypertrophied
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