INSECTA BRITANNICxL 



DIPT ERA. 



Os stictorium, proboscide, setis indusis, pcdimque. 

 Aim hincB ; Jialteres bini pone alas. 

 Tarsi pentmneri. 



Synonyma.* 



Oken, 1821. — Bm-meister ; Strauss Durckheim ; Ericlison ; Siebold. 

 Antliata; Sdiioedte, 1811. 



Biptera et Stictoria : Degeer, 1778 ; Latreille, 1797 ; Savigiiy ; Dnges. 



Diptera et Aptera -. M'Leay, 1821. 



Biptera et Siphonaptera : LatreiUe, 1825. 



Biptera G.i A])Jianipter a : Kii'by, 1826; Westwood. 



Biptera, Omaloptera et Aptera: Leach, 1819. 



Biptera, Fupipara et Suctoria: Latr., 1821. 



Biptera, Homalojytera Qi Aphanipter a: Stephens, 1827; Curtis. 



Biptera, Omaloptera et Ftdicai'ii : Eondaui, 1811. 



* The synonyms are arranged in the follov\Tng gradations : — 



Lines. 



T -p • 1 i f 1, homonymous 1 



1. ijqmvalent • •{ o o 



^ '• Z, synonymous x, 



„ ^ 1, .. r 1 , in two members 3-0 



z. Collective . . ■< o • ^i i ^r in 



>■ 3, in thi'ee members 7-l*J 



3. Supiileraentary . An entire group and part of another co-ordinate . . 11-17 



4. Indefinite . . . Portions only of groups . 18,19 



5. Ancient, before the distinct gradations of groups were observed . . . 20-22 

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