THE MYCETOPHILIDA. 137. 
The round head and circular eyes, the ocelli being nearly equal 
and in a curved line, and the cylindrical joints of the antennz, be- 
sides the veins, at once distinguish this genus. 
Grenus.—JLasiosoma, Wtz. = Sctophila, Mg. 
The larve of this genus live in fungi and rotten wood. The 
gnats may be found in woods and thickets. The genus may 
be distinguished by the base of the fourth hind areolet being 
much further from the base of the wing than is the base of the 
second hind areolet. It is nearly allied to Sciophila, but the costal 
does not extend to the tip of the wing as it does in Scophila. 
There are seven species of this genus found in Great Britain. 
S. hirta, Hoffm. 
S. pilosula, Zett. 
Blackish-brown. Head brown. Palpi testaceous ; antennz longer 
than thorax. Abdomen brown. Legs yellow; tarsi brown, yellow 
at the base; posterior femora dark at the base and tips ; posterior 
tibize also dark at the tips. 
Wings with a brownish-gray tinge ; first cubital areolet of moderate 
size, oblong. ‘This is a fairly abundant species. Length 1} to 2 lin. 
L. rufilaterum, Wik. = S. rujfilatera, W\k. 
This is a dark brown insect; palpi yellowish ; antennz blackish- 
brown, tawny at the base. Thorax with a tawny spot on each side 
in front. Abdomen tawny on each side, except towards the tip. 
Legs tawny ; tarsi brown; posterior tibiz with minute spines and 
rather long spurs. Wings grayish. First cubital areolet very small, 
almost sguare. Length 1? lin. Scarce species. 
The following are the other British species : 
L. luteum, Macq. Dale has bred this species from larvz feeding 
in a web on a fungus on a pear tree. The imago is yellowish, with 
dark brown head. 
L. ochraceum, Wik., Ins. Brit. Dip., vol. iii., p. 41. JZ. maura, 
Wlk., zbid. p. 42. ZL. fenestredia, Curtis, British Ent., 641 (1837). 
L. rufum, Mg. 
L. hirtum, Mg. = 
GeENuS.—Monoclona, Mik. 
M. halterata, Staeg. 
This is a rare species, resembling S. (Z.) rufum, Mg., in appear- 
ance. ‘The imago is testaceous ; the head has front and vertex dark- 
Thorax blackish-gray, beset with long whitish-yellow hairs. Areolet minute. 
Abdomen as in #z7¢a, Sub-costal obsolete. 
Melanoceras= Antenne guite black. Sub-costal complete. Areolet elongated 
and dilated at the tip. Holywood, near Belfast (Haliday), : 
