10. Foot of Asilus
11. Foot of Thereva
12. Profile of Eumerus
13. Profile of Syritta
14. Profile of Helophilus
15. Profile of Volucella
16. Profile of Rhingia
17. End of abdomen of Dolichopus 4 (a) the forceps (b) the pennis (c) the lamellæ
18. Head of Psarus, viewed from above, showing frontal process
19. Shape of the proboscis in Empis