Falkland Islands Diftera. 



391 



broad pale silvery eye margins, and with an ill-defined leaf-shaped 

 darker area enclosing the ocelli, whose point nearly reaches the 

 forehead. Surrounding this leaf the frons is broadly paler than 

 the remainder of its surface (and shows ochreous in a side light), 

 so that a darker triangle is left each side bounded by the eye 

 margin, the forehead, and a line from forward vertical bristle to 



Fig. 2. — Synhoplos stuideeanus. Fig. 3. — Synhoplos sturdeeanus. 



nearly the centre of the forehead. The chaetotaxy is as follows :— 

 ocellar bristles divergent, inserted just outside middle of line join- 

 ing ocelli ; forward vertical bristles on middle of wide eye margins 

 converging to centre, long hind verticals somewhat divergent but 

 straight; two large orbital bristles each side overhanging eyes, 

 with a preceding, intermediate and following smaller bristle. Other 

 smaller bristles are as follows : a row of some six bristles on sloping 

 boundary of black triangle mentioned above, the front ones longest 

 and strongly converging to centre; a clump of fine bristles exists 

 between the hind ocelli and the vertex; the upper bristles of the 



