410 DIPTERA OF AUSTRALIA, 



mediate-lgs about I, and in the hind-legs nearly ^, longer than the 

 tibiae. Spurs yellow. First joint of the tarsi twice the length of 

 the second ; second joint 5 longer than the third and equal to the 

 fourth and fifth combined ; the latter two of equal length. Wings 

 pellucid, almost hyaline, with a pale greyish tint ; rather brilliant 

 reflections ; costal and first two longitudinal veins dark brown. 

 First longitudinal vein reaching the costa considerably before the 

 base of the fork ; cross-vein tolerably distinct ; petiole very pale, 

 as long as or slightly shorter than the posterior branch of the fork ; 

 branches slightly and gradually divergent ; posterior branch a 

 little undulated, fg twice the length of gh ; Id shorter than hw 



<^. — Antennae short, slender ; flagellar joints sessile. Abdomen 

 robust, deep brown, almost black, lighter between the segments ; 

 lamellae of the ovipositor small, oval. In the fore-legs the tarsi 7, 

 in the intermediate legs ^, and in the hind-legs very slightly, 

 longer than the tibiae. First longitudinal vein reaching the costa 

 a short distance before the base of the fork ; petiole shorter than 

 the posterior branch of the fork, fg slightly^more than twice the 

 length of gh. 



Hah. — Benalla, Victoria (Helms). Eight specimens in November. 



Obs. — The venation of the wings at once distinguishes this 



species. 



Genus Zygoneura, Meigen. 



Zygoneura, Meig., Syst. Beschr. VI. 1830, p. 304, pi. 65, fig. 15; 

 Macquart, S. a B., Dipt., I. 1834, p. 158; Zetterstedt, Dipt. 

 Scand. ; Walker, Ins. Brit. III. 1856, p. 57; Schiuer, F. A., Dipt., 

 1864 ; Winnertz, V. z.-b. G., Wien, XVIII. p. 11, 1867. 



Characters the same as in Sciara with the following differ- 

 ences : — Antennae : the first joint of the scapus more bowl-shaped ; 

 in (J the flagellar joints oval, long-stalked and verticillate. Thorax 

 glabrous. Tibiae without lateral spines. Wings : the branches of 

 fork undulated, the anterior one much arcuated at the base, so 

 that the fork appears bulged. 



Only two species of the genus have hitherto been described, 

 Zygoneura sciarina, Meig., from Europe, and Z, toxoneura, O.- 

 Sack., North America. 



