40 DIPTERA OF AUSTRALIA, 



% 



B. Transverse vein very oblique, originating at the root of 

 the first longitudinal vein. 



Dirhiza. — The second longitudinal vein not undulating at the 

 base, but ascending in a flattened arcuation, and the flagellar 

 joints of the antennae sessile or almost sessile in the ^. 



JEpidosis. — The second longitudinal vein ascending from the base 

 with a double curvature, reaching the wing-margin beyond the 

 apex. 



The number of the antennal joints unknown ; the joints 

 pedicelled in both sexes. 



II. Wings with four Longitudinal Veins. 



Asynapta. — (a). The transverse vein and the root of the second 

 longitudinal vein as in Epidosis. 



(b). The transverse vein and the second longitudinal vein 

 as in Diplosis. 



II. Spaniocera, Winnertz, 



III. Lasioptera, Meigen. 



(a). Wing with a white spot in the middle of the costal 



vein, 

 (b). Wing without spot, 

 Clinorhyncha. — Mouth parts prolonged in a rostrum. 

 With regard to the second section of the family, Winnertz prefers 

 to look upon its species as representing a distinct family having 

 its proper position between the Cecidomyidae and the Myceto- 

 philidse. He afterwards (in 1869) wrote a paper solely on this 

 section, which we will consider in its turn. 



Baron R. Osten-Sacken, in 1862, wrote a preliminary or intro- 

 ductory paper on the North American Cecidomyidte which appeared 

 in the first monograph on Diptera issued by the Smithsonian 

 Institution, and mainly prepared by Prof. Loew. In the first part 



