Edited by Chang Zhu
1. Anesthetize the files and exam the files under a dissecting microscope.
Use a hairbrush (paintbrush) or feather for moving files around.
2. Looking for the following differences:
The most reliable difference is the sex combs.
- Males have sex combs on the front legs.
- In older files the posterior part of the abdomen is quite dark in males
than in females.
- The tip of the abdomen is more rounded in males than in females.
- In general males are smaller.