348 Mr, F. W. Edwards’ Notes on British Mycetophilidae. 
10. Anal vein strong, almost reaching the hind margin; rather large 
species usually with an entirely shining black thorax; tip 
of costa scarcely extending beyond Ry+, .« semirufa, Mg, 
Anal vein weaker; usually disappearing much before the hind 
margin; if with a black thorax, then small species; costa 
distinctly produced beyond tip of Ry+; . . . . OH. 
11. Front tibiae ey ih nine than the metatarsi; thorax 
black Waves : SON see) Series 
Front tibiae at most as this as rs qdethteisi: thorax yellow or 
with yellow ground colour. .. Pens ve kee 
12. Wings with the apex broadly though homieeinti faintly darkened 
nemo ralis, Mg. 
Wings clear . ; TE CON ig 0455 2 
13. Abdominal segments 2 4 bale at the apex ; R. »+3 rather long and 
Sambi ey ak ps : zonata, Zett. 
Abdominal segments 2-4 gia at ‘fis A R,+3 short and 
almost vertical re P26 oy eat perpusilla, sp. n. 
14. Third and fourth costal diiuibus about equal; wings almost 
or quite clear ; .  . aestivalis, Winn. 
Third costal division pousiderably shar ter than the fourth. 15. 
15. Wings almost unmarked; costa extending half the distance 
between the tips of R,+, and M,+, pectinifera, sp. n. 
Wings with a dark fascia before the apex; costa extending at 
most one-third of the distance between the tips of Ry; and 
i) ree re ri gsi) Cicer as 
16, Abdomen stininly or eatin lei there of male with three 
large confluent shining black stripes .  .  nigricornis, F. 
Abdomen largely or mainly reddish yellow; thorax reddish 
yellow in both sexes. . 3) pate ct heel te 
17. Inner edge of wing-fascia piotubeeant ucimaen R,+, and M,+, 
fasciata, Mg. 
Inner edge of wing-fascia indented between R,+, and M,+, 
unicolor, Staeg. 
P. marginata, Mg. Enderlein (Stett. ent. Zeit. 1911, 
p. 163) introduces the genus Paraplatyura for this species, 
basing it on the neuration, but since Loew’s P. occlusa 
exhibits an intermediate structure, the separation of this 
species from Platyura seems undesirable. Enderlein places 
it in the Sciophilinae, obviously an error. In any case 
Paraplatyura would be antedated by Apemon, Johannsen 
(Gen. Ins. 1909, p. 20). P. marginata has the faint fold- 
like basal extension of the media and the absence of bristles 
on the whole body characteristic of Apemon, but some other 
