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 ; antennse 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 prcebrachial 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 tibiae 

 brownish, no spines. Length 3 lin. Not an uncommon gnat. The 

 life history unknown. 



I Mycetophila, Mg. 

 Genus Boletina, Staeg. = • Leia, Mg. 



I Leptomorphus, Wlk. 



This genus of gnats much resembles the Mycetophiloe, 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 ? ; 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. Antennre slender, i6-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 tibiae ; spurs 

 longish. Hypopygium and ovipositor small. These gnats frequent 

 woods and damp places, and in their habits they much resemble 

 Mycetophilae. The larvae live in fungi and in rotten wood. Beling* 

 describes one from rotten and " decaying leaves in a forest of 

 deciduous trees " in Denmark. Closely allied to this genus is Gnoriste, 

 which is not, however, found in England. The Boletinse 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., 1S75, P- S^- 



