44 DIPTERA 



S. ROPALUs. Walker, I.e., p. 593 (1849). 



Head tawny^ coppery on the crown; eyes red; feelers tawny; 

 bristles black. Thorax coppery ; sides tawny ; scutellum orange ; 

 breast hoary. Abdomen black, narrow, linear, orange on each side of 

 the base, adorned with four broad orange bands, of which the first and 

 fourth are interrupted along the mid-back. Legs tawny. Wings 

 colourless ; wing-ribs and poisers tawny ; veins black, tawny towards 

 the base. 



Length of the body, 4 lines. 



New Zealand (Dr. Sinclair). 



S. noVjE-zealandi^. Macquart, I.e., Supp. \.,p. 115 (1854). 



Female. Face covered with white down with reddish reflections ; 

 prominence shining-black. Front shining-black, a little white down 

 on the sides in front. Antennse black. Thorax green-bronze, sides 

 with whitish down and hairs. Scutellum brownish-yellow. Abdomen 

 but little shining, with dull reflections ; second, third, and fourth 

 segments with a narrow interrupted yellow band, reaching the exterior 

 border ; the fifth shining-black ; belly shining-black. Legs black ; 

 fore tibiae brown. Poisers brown. Wings greyish ; veins normal. 



Polynesia and New Zealand (M. Bigot). 



S. RECTUS. Nowieki, I.e., p. 34 (1875). 



Female. Antennae black; the whole of the front and a broad 

 facial vitta aeneous -black. Thorax aeneous-green, passing into black 

 aeneous ; abdomen intense black, the second, third, and fourth seg- 

 ments ornamented with a sub-basal fascia broadly interrupted, yellow 

 dusted with whjte ; the anterior angle of the fifth segment yellow 

 lightly dusted with white. Anterior legs testaceous, the whole of the 

 tarsi and the base of the femora black; posterior legs all black. Wings 

 cinerco-hy aline ; stigma fuscous. 



Length, 44 lines ; wing, 4^ lines. 



New Zealand (Edwards). 



Genus-PLESIA. 



Maequart. 

 Pace rather prominent, with a projection. Third joint of the 

 antennae oval; style naked. Eyes naked. Abdomen of the same 

 breadth as the thorax ; the sides straight. Legs simple ; posterior 

 tibiae arched, first joint of the posterior tarsi slightly swollen. First 

 posterior cell closed, rather distant from the posterior border, appendi- 

 culate or elbowed ; the second cross-vein almost perpendicular. 



