792 DIPTERA OF AUSTRALIA, 



base of stem pale ochreous. Abdomen brown ; venter more or 

 less ochreous ; ovipositor rather long, slightly curved, brown. 

 Coxse ochreous ; trochanters very slightly tinged with blackish at 

 tip; femora brown, white at tip; tibiae brown with a slight ring at 

 base, and a third of their length at distal end, white ; tarsi entirely 

 white. Wings hyaline, with brilliant purplish and golden re- 

 flections ; veins brown ; stigma pale, slightly tinted with brownish. 

 Auxiliary vein reaching costa opposite or somewhat beyond inner 

 end of first posterior cell ; sub-costal cross-vein near its tip, con- 

 necting it with the first longitudinal vein ; preefurca short, slightly 

 arcuated at its base ; petiole of sub-marginal cell rather more than 

 half the length of prsefurca ; small cross-vein nearly as long as 

 the great cross-vein ; third posterior cell more than three times 

 broader at the tip than at its inner end, principally owing to the 

 divergence of the posterior branch of the fourth vein ; great 

 cross-vein situated about middle of discal cell, the latter slightly 

 angulated at that point. 



Hah. — Knapsack Gully, Blue Mountains, and Woronora, N.S.W. 

 (Masters and Skuse). Six specimens. 



Genus 8. Orimarga, O.-Sacken. 



Z^mno6^a, Zetterstedt, Dipt. Scand. X. p. 389, 1851; Orimarga, 

 O.-Sack., Mon. Dipt. K Amer. IV. p. 120, tab. i. f. 9, 1869; 

 JVinguis, Wallengren, Entom. Tidskr. Stockh. 1881 (on authority 

 of Mik) ; Orimarga, O.-Sack., Studies II. p. 186, 1887. 



" One sub- marginal cell ; four posterior cells ; discal cell open, 

 coalescent with the second posterior cell ; great cross- vein about 

 the middle of the wing, and hence, the fourth posterior cell 

 very long. Tibiae without spurs at the tip ; empodia distinct. 

 Antennae 16-jointed. Basal pieces of the male forceps elongated, 

 slender, with horny, slender, claw-shaped appendages nt the tip ; 

 upper valves of the ovipositor small, slender, pointed." (Osten- 

 Sacken). 



The following described are, as far as I can ascertain, the first 

 species of this genus discovered out of Europe. A Itogether only 

 a few examples seem to be known. 



