Plate VIII 



Hydrous triangularis Say 



Fig. 1. Full-grown larva, dorsal view. 



Fig. 2. Left mandible, first stage larva. 



Fig. 3. Right mandible, first stage larva. 



Fig. 4. Right maxilla, first stage larva. 



Fig. 5. Right mesothoracic leg, first stage larva. 



Fig. 6. Right antenna, first stage larva. 



Fig. 7. Head without appendages, dorsal view, first stage larva. 



Fig. 8. Motory stylus of pupa. 



Fig. 9. Egg-case. 



Fig. 10. Labium, dorsal view, first stage larva. 



