158 AN ACCOUNT OF BRITISH FLIES. 
~ length of wing ; fourth longitudinal forked ; fork long ; the upper 
prong apparently xot united to the fork ; fifth curved to posterior 
border; sixth very undulated. This is a very small species—not 
more than 4 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; tibiz luteous, blackish tips; hind 
tibiz with blackish band across middle. Sub-costal vein less than 
one-third length of wing. Recorded from Ireland by Haliday. 
S. incompleta, 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. pulicaria, Lw. 
This species has clear wings and short peduncle ; complete forks. 
S. infumata, Hal. = S. fuscinervis, 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. Tibiz white towards base and at 
tips; tarsi white, black towards tips. ‘“ Rare in moist groves.” 
Described by Haliday in Ext. 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. recurva, Lw. 
Wings narrower than in subnitens, the thorax dull, and the forks 
not diverging so greatly. A common garden species. 
S.-minutissima, Ver. 
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. Tibize all widen towards the tip. Occurred in profusion 
at Pagham Harbour in 1876. 
* Ins. Lapp., 8o1. 
