36 DIPTERA OF AUSTRALIA, 



was split up into tribes, adopting exactly the same terms 

 employed by Latreille to designate his subdivisions, viz. : — T. 

 Culiciformes, Terricoles, Fongicoles, Gallicoles, and Florales; the 

 fourth of these at the same time stood as follows : — 



A. Wings lying horizontally, with a small number of veins. 

 B. Four posterior cellules ; second petiolate. 



C Second posterior cellule narrow at the base. 



1st Genus Lestremia. 

 CO. Second posterior cellule very wide at the base. 



2nd Genus Zygoneura. 

 BB. Three or four veins only. 



D. Three longitudinal veins. 



3rd Genus Cecidomyia. 

 DD. Two longitudinal veins. 



4th Genus Lasiojitera. 

 AA. Wings bending in the form of a roof, with numerous veins. 



5 th Genus Psychoda. 



This author remarks that the genera Lestremia and Zygoneura, 

 by the neiiration of the wings, approached the Fongicoles (now 

 the family Mycetophilidee), among.st which he placed Campy- 

 lomyza ; and also that Psychoda was related to tlie Florales 

 (now Rhyphidpe and Bibionidje) by the shortened form of the body 

 and the feet. 



Rondani in 1840 made the fir.st attempt at a division of 

 Cecidomyia into sub-genera, and he also divided the whole family 

 into two great sections, CecidomyinjE and LESTREMiNiE, the latter 

 to admit the genera Gampylomyza, Gatocha, Lestremia, and his own 

 new genus Micromyia ; but he founded his scheme on such uncer- 

 tain criteria that subsequent authors have regarded it as entirely 

 worthless, though it can scarcely be estimated of no value, for his 

 project at least formed the basis of a more perfect classification. 

 Since then Rondani has established a'laumber of genera in this 

 family, afterwards discovered to be synonymous with genera 

 already accepted. 



J 



