iss

th. order, Diptera, containing the following Genera:

1. Oestrus.   Gad-fly.

Antenna taper, growing from a small point. Mouth simple orifice. Feelers two. Stemmata three.

2. Tipula.   Crane-fly.

head long. Feelers curved. Proboscis short, arid bent inwarch Upperjaw like an arch.

3, Musca.   Fly.

Mouth formed into a fleshy proboscis, with twQ lateral lips. Palpi none.

4. Tabanus.   Tabanus.

Trunk fleshy, terminated by two lips. Palpi, one on each side of the trunk.

5.   Gnat.

Antenn, in the males, feathered. Mouth, consisting of setaceous piercers, within a flexible sheath.

6. .gimps.   Empis.

Mouth with a horny, inflected, bivalve snout, longer than the thorax, with horizontal valves.

7. Gonops.   Conops.

Mouth with a long, jointed snout.

8. 4i(us.