158 AN ACCOUNT OF BRITISH FLIES. 



length of wing ; fourth longitudinal forked ; fork long ; the upper 

 prong apparently not tinHed to the fork ; fifth curved to posterior 

 border; sixth very undulated. This is a very small species — not 

 more than \ to \ lin. in length. Found in rough herbage and grass. 

 Zetterstedt* says concerning this species : " Speciatim in Alopecuro 

 geniculato,^'' in July and August. 



S. bifilata, Hal. 

 Black ; thorax with pale pubescence, shiny. Primary veins pale 

 yellow. Legs piceous black ; tibiae luteous, blackish tips ; hind 

 tibiae with blackish band across middle. Sub-costal vein less than 

 one-third length of wing. Recorded from Ireland by Haliday. 



S. inco/nptefa, Ver. 

 Small species; black; abdomen shining ; distinct venation; second 

 vein extending far beyond the middle of costa ; curves into costa at 

 its end. The forked vein starts at the transverse veinlet, forks about 

 same length as peduncle; both vanish before they reach edge of wing. 

 Wings very dark. Appears in August. 



S. pu/ican'a, Lw. 

 This species has clear wings and short peduncle ; complete forks. 



^. infumata, VLa.\. = S. fuscinefris, Lw. 

 Black, with gray wings ; sub-costal vein ends a little beyond 

 one-third of the length of the wing ; radial ending with costal at 

 beyond two-thirds of the length. Tibiae white towards base and at 

 tips; tarsi white, black towards tips. "Rare in moist groves.'' 

 Described by Haliday in Etit. Mo. Mag., i. 159, 1833. 



S. subnitens, Ver. 

 Black, long, shining thorax ; wings broad ; forks of the forked 

 vein widely diverging at the tip. A very rare species, found in May, 

 and recorded by Verrall from Denmark Hill in 1868, and not again 

 until 1873. 



S. rccurva, Lw. 

 Wings narrower than in subnitens, the thorax dull, and the forks 

 not diverging so greatly. A common garden species. 



.S". fiifitutissi/na, \tx. 

 A very minute species appearing in June. Dull black and narrow. 

 Thorax brownish at sides and clothed by pale pubescence. Abdomen 

 very depressed ; legs brownish ; tarsi, halteres, and short palpi dirty 

 dull white. TibiiE all widen towards the tip. Occurred in profusion 

 at Pagham Harbour in 1876. 



* In^. Lapp., 801. 



