673 DIPTERA OF AUSTRALIA, 



C. Cross-vein situated beyond the middle of the first longi- 

 tudinal vein, 



b. Tip of the second longitudinal vein and tip of the j)osterioT 

 branch of the fork equally near the apex of tJie wing. 



(No. 136). 



Genus 1. Sciaua, Meigen. 



Sciara, Meigen, Illiger's Magazine II., 263 (1803) ; Molobrus^ 

 Latreille, N. Diet. d'H. n. (1804); (Sciara, Macquart, Hist. n. des 

 Ins. Dipt. I., p. 147(1834); Zetterstedt, Dipt. Scand.; Walker, 

 I, B. ; Schiner, F.A. Dipt., 1864; Winnertz, V. z.-b. G., Wien, 

 Band xviii., p. 11. 



Head small, roundish, front somewhat flattened ; hypostoma 

 and front broad. Eyes renifonn, broader below than above, 

 approaching on the front, or contiguous. Ocelli three, arranged 

 in a triangle on the vertex, the lower one smaller than the 

 two upper ones. Proboscis slightly projecting. Palpi short, 

 prominent, four jointed, the first joint very small, second and 

 third joints almost of equal lengths, the last joint more or less 

 elongate. Antennae arcuated, projecting forward, 2--f- 14-jointed, 

 always longer in the ^ than in the 9 ; the joints of the scapus 

 cyathiform, almost bare, those of the flagellum cylindrical, 

 pubescent, sessile or sub-sessile, the last joint elliptical or elongate. 

 Thorax ovate, gibbose ; scutellum small. Halteres large, with a 

 microscopic pubescence, usually very sparingly setose. Abdomen 

 seven-segmented, in the ^ almost cylindrical or more coniform, 

 with holding-forceps ; in the 5 acuminate ; ovipositor generally 

 long, with terminal lamella. Legs slender, frequently very long. 

 Coxse somewhat elongate. Femora with a shallow furrow on the 

 inner side. Tibiae with small spurs, with or without lateral spines. 

 Last joint of the tarsi with pulvilli. Wings large, microscopi- 

 cally hairy, rounded at the base and apex. Fork of the third 

 longitudinal vein more or less cuneiformly narrowed towards the 

 base. Fifth longitudinal vein imperfect or altogether wanting. 



