192].] 171 



behind front tibiae; middle tibiae witli '2 posterodorsal bristles; 

 hind tibiae with 1-2 anteroventral, 2 anterodorsal, and 1 much sliorter 

 and inconspicuous postered orsal, bristles. Hind femora with 3-4 

 anteroventral bristles towards tip, but short-haired posteroventrally. 

 Wings faintly brownish. Squamae whitish-yellow. Halteres 

 yellow. 



$ . Interfrontalia very distinct and reaching to front of frons. 

 Facial orbits at narrowest part hardly as wide as third antennal 

 joint. Arista very distinctly pubescent. Thorax grey, with three 

 narrow brownish stripes, the outer ones down the line of dorso- 

 central bristles. Abdomen grey, with a pair of small triangular 

 brown spots on the 2nd and 3rd segments, those on third segment 

 very little smaller. Legs stouter than in male and with stronger 

 bristles. Wings clearer. 



Length about 4-o nun. S ; 5 mm,, $ }. 



This species is probably not uncommon in Britain. Specimens 

 have been examined from the following localities : — Uoone Valley 

 (Devon), Crymlyn Bog (Glamorgan), New Forest ( Hants), Sherwood 

 Forest (Notts), Ranuoch (Perth), and the Isle of Arran ; captured 

 by Mr. Verrall, Mr. C. G. Lamb, Dr. Sharp, Col. Yerbiiry, and 

 Prof. J. W. Carr in June and July. It would appear that Zetter- 

 stedt's earlier name of inma must be used for this species. 



30 (29) Thorax, without a lighter patch in front of scutellum. 



31 (32) Abdomen, viewed from behind, with the dark patches on the second 



segment distinctly separated by a greyish central stripe 



.... *12. marina, sp. n. 



S . Eyes distinctly but sparsely hairy, the hairs longer above but 

 becomino- very short below. Frons at narrowest part rather wider 

 than third antennal joint, the frontalia much wider than the narrow, 

 rather dusky orbits. Face very wide, facial orbits about as wide as 

 third antennal joint ; jowls | the vertical diameter of eye. Arista 

 distinctly pubescent. Thorax dull blackish, without stripes, burner 

 very indistinctly greyish. Abdomen, viewed from behind, with the 

 tirst segment very extensively darkened ; second segment with a pair 

 of broad subquadrate black patches; third segment with much 

 narrower patches, but, like those on second segment, occupying the 

 full length of segment; fourth segment with a slight darkening 

 about the central line. Front tibiae sometimes with a small bristle 

 behind; middle tibiae with posterodorsal bristles : hind tibiae with 

 2 anteroventral bristles just below middle, and one anterodor.-al 

 bristle at about middle. Hind femora with 4-o anteroventral 

 bristles on apical half. Wings distinctly infuscated, especially about 

 base. Squamae rather yellowish, especially towards margins. 

 Halteres dusky. 



5. Eyes practically bare. Interfrontalia produced ti> front of 

 frons, and slightly glistening in some lights but not shining as in 

 aerea. Frontal orbits brownish-grey. Thorax rather dark brownish- 

 grey; the brownish colour may break up into wide stripes (especially 

 behind) leaving the rest of thorax greyer, but with indicaliuas right 



u2 



