1 oe) AN ACCOUNT OF BRITISH FLIES, 
The perfect insect has a brown thorax with four black stripes. 
The abdomen is dark brown, almost black. Antennz brown. Wing 
nearly limpid (sb Aya/inis), 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.* 
; _ | Lipula pallipes, F. 
Se. Chironomus pallipes, F 
Black ; thorax slightly shiny ; ventral surface yellowish. Antennz 
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 doubis 
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 /emon-yellow larve, capable of /eaping, 
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 Z7/ico/a larve 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 tilie 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 line of length, and of a dright yellow colour, and 
has the faculty of /eaping, like the larva of Piophila.” 
The izmago of Tilicola is dusky, with somewhat shiny thoray. 
Antenne 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. 
+ Character of larvze of Mycetophilidz, Osten-Sacken, p. 17. 
