132 AN ACCOUNT OF BRITISH FLIES. 
A, nemoralis, Mg. = Boletina elongata, Curtis. 
Blackish-brown. ‘The body long, slender, shining ; head brown ; 
hairs yellowish ; thorax with a tawny spot on each side in front. 
Palpi yellowish ; antennz blackish-brown, yellowish at the base. 
Wings with brownish tinge, yellowish costa and brown veins; third 
longitudinal vein undulating; fourth longitudinal vein not forked, 
but accompanied by a secondary vein, ending behind the tip of the 
wing ; fork of fifth and tip of preebrachial areolet at an equal distance 
from the base of the wing ; sixth vein fairly long. Legs testaceous, 
long and slender ; brown at their base and also the tarsi ; hind tibiz 
brownish, no spines. Length 3 lin. Not an uncommon gnat. The 
life history unknown. 
Mycetophila, Mg. 
Genus Soletina, Staeg. = < Leia, Mg. 
| Leptomorphus, Wik. 
This genus of gnats much resembles the Mycetophilz, but they are 
of a more slender build than the latter, and the sub-costal, or first longi- 
tudinal vein, is much longer. The following may be taken as the chief 
characters of the genus: Body 7-segmented and slender, cylindrical 
in ¢, subfusiform in 9; thorax large, convex, short ; head small, 
and ventrally placed; eyes oval, ocelli three, central one below 
lateral ones and small; the palpi are curved outwards. Proboscis 
scarcely elongated. Antennz slender, 16-jointed compressed, about 
twice the length of thorax in the ¢', and about same length as thorax 
in the ? ; very few hairs. Wings broadish; costal vein not long, scarcely 
reaching tip of wing; first longitudinal vein long, nearly half length 
of wing ; second longitudinal straight, not ending quite at the tip; 
third longitudianl vein joins tip of costal; fourth and fifth forked ; sixth 
distinct, but not reaching the border of the wing; seventh small. 
Legs slender, of moderate length ; a few bristles on the tibiz ; spurs 
longish. Hypopygium and ovipositor small. These gnats frequent 
woods and damp places, and in their habits they much resemble 
Mycetophilz. The larve live in fungi andin rotten wood. Beling* 
describes one from rotten and “decaying leaves in a forest of 
deciduous trees” in Denmark. Closely allied to this genus is Guoriste, 
which is not, however, found in England. The Boletinz seem to be 
northern insects, many being found in Norway, Sweden, Greenland, 
Lapland, etc. ; but they are equally abundant in warmer climates. 
* Wiegm. Archiv., etc., 1875, p. 56. 
