no AN A ceo UNT OF BRITISH FLIES. 



The perfect insect has a brown thorax with four black stripes. 

 The abdomen is dark brown, almost black. Antennae brown. Wing 

 nearly limpid {sub kyalinis), with the veins dark. The second longi- 

 tudinal vein extends to the fork of the fourth longitudinal vein. The 

 latter is indistinct before the fork. Halteres brownish. Legs tes- 

 taceous or yellowish ; tarsi brown, or even black. 



Meigen obtained this species from flower-pots.* 



' L/nroiiounis palltpes, r. 



Black ; thorax slightly shiny ; ventral surface yellowish. Antennae 

 slender, ^-length of body. Wings limpid ; veins dark-brown. Second 

 longitudinal vein extending to fork of fourth longitudinal vein before 

 joining the costa, more than half the length of wing. Fourth 

 longitudinal vein pale before the fork. Legs yellowish ; tarsi dark. 



Walker says this species is common, but Verrall evidently doubts 

 its authenticity, it being in italics in his list. The life-history appears 

 to be unknown. 



S. tilicola, Lw. 



This fungus gnat is supposed by Loew to form a gall on the leaves 

 of young linden trees. Winnertz first discovered this curious habit, 

 and noticed that the galls were present on the leaves in shady and 

 sheltered situations : " The leinon-yelloiv larva, capable of leaping., 

 like cheese maggots, lives in numbers in the stem, generally near 

 the origin of the last or two last leaves. Each of them has a hollow 

 of its own, and produces a swelling of the size of a pea, which it 

 abandons before its transformations."! Osten-Sacken and Professor 

 Mik do not believe this account. They consider the galls are 

 formed by some Cecid, and that the Tilicola larvie are only "inqui- 

 lines " in the galls. 



It is most probable that the galls are the same as those described 

 by Walker as produced by Cecidomyia tilicc. on the young shoots 

 growing from lime-trees. He says : " They (the galls) are round or 

 oblong ; more than twenty cells, each inhabited by one larva. The 

 latter is about one Hne of length, and of a bright yellow colour, and 

 has the faculty oi leaping, like the larva oi Fiophila." 



The imago of Tilicola is dusky, with somewhat shiny thorax. 

 Antennoe slender, yellowish. Wings nearly limpid, with costal nerves 

 brown ; the remainder pale. Legs dusky yellow ; tarsi dark, with 

 somewhat yellowish bases. 



* Eur. Zweif, i., p. 233. 



t Character of larva; of Mycetophilidrc, Osten-Sacken, p. 17. 



