INSECTA BRITANNICA. 



D I P T E R A. 



Os suctorium, prodoscide, setis inclusis, palpisque. 

 Alts bina ; halteres bini pone alas. 

 Tarsi pentameri. 



Synonyma* 



Oken, 1821. Burmeister ; Strauss Durckheim ; Erichson ; Siebold. 

 Antliata; Schioedte, 1841. 



Diptera et Suctoria : Degeer, 1778 ; Latreille, 1797 ; Savigny ; Duges. 



Diptera et Aptera : M'Leay, 1821. 



Diptera et Siphonaptera : Latreille, 1825. 



Diptera et ApJianiptera : Kirby, 1826 ; Westwood. 



Diptera, Omaloptera et Aptera: Leach, 1819. 



Diptera, Pupipara et Suctoria: Latr., 1821. 



Diptera, Homaloptera et Aphaniptera: Stephens, 1827; Curtis. 



Diptera, Omaloptera et Pulicarii: Eondani, 1841. 



* The synonyms are arranged in the following gradations : 



Lines. 



1. Equivalent . { \> ^onymous 



i 2, synonymous 2 



o ruii^,-^ f 3 , in two members 3-6 



A. l^oilective . < n . ,-, /VTA 



l 2, in three members 7-10 



3. Supplementary . 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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