8a (6b). Tarsi almost always with 5 segments; mouthparts for sucking; hind wings knob-like, reduced to

halteres (Figs.A-E); body lightly sclerotized (= hardened) [flies]...............Diptera........... 88

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A

B

C

D

E

8b. Tarsi with 2-3-segments; mouthparts variable; hind wings reduced or absent, not haltere-like .... 9