BY FREDERICK A. A. SKUSE. 793 



316. Orimarga australis, sp.n. (PI. xxi., fig. 10). 



(J. — Length of antenna3 0-042 inch ... 1'06 millimetres. 



Expanse of wings 0-250 x 0-042 ... 6-34 x 1-06 



Size of body 0-210x0-020 ... 5-33x0-50 



9. — Length of antennae 0-042 inch ... 1-06 millimetres. 



Expanse of wings 0*270 x 0-045 ... 6-85x1-13 



Sizeof body 0-210x0-020 ... 5-33 x 050 



Head, rostrum, palpi and antenna3 light reddish-brown ; head 

 hoary in a certain light ; rostrum rather longer than the head. 

 Thorax brownish-ochreous, hoary. Halteres pale. Abdomen 

 brownish-ochreous to light reddish-brown ; genitalia ferruginous. 

 Legs uniformly pale yellowish -grey, apparently glabrous. Wings 

 narrow, microscopically granulose, with a somewhat whitish 

 appearance, non-iridescent ; veins , like the membrane, colourless ; 

 stigma not visible. Auxiliary vein reac hing costa opposite | the 

 length of prsef urea ; sub-costal cross-vein a little before tip of 

 auxiliary vein ; first longitudinal vein reaching costa at a point 

 opposite tip of posterior branch of fourth longitudinal, and at | 

 the distance from tip of auxiliary vein to apex of wing ; second 

 longitudinal originating at about middle of the length of wing, 

 angularly bent near its origin, then running almost straight ; 

 prsefurca § the length of sub-marginal cell ; marginal cross-vein 

 opposite small cross- vein, and at a point J the distance from inner 

 end of sub-marginal cell to tip of first longitudinal vein ; veins 

 inclosing first posterior cell almost parallel, slightly convergent 

 towards their tips ; inner end of second posterior cell a little 

 before small cross- vein ; great cross- vein a little oblique, situated 

 at a point mid-way between origin of second longitudinal vein and 

 inner end of submarginal cell ; sixth longitudinal vein converging 

 towards fifth longitudinal vein at the tip. 



Hah. — Middle Harbour, near Sydney (Skuse). Three specimens. 



Ohs. — The alar venation of this species chiefly differs from that 

 of 0. alpina, Zett., figured by Baron O.-Sacken (Mon. Dipt. K 



