380 Mr. F. W. Edwards’ Notes on British Mycetophilidae. 
joints. C. mtens may be at once separated from the three 
following by its shiny black thorax. 
C. fasciata, Mg. (? flaviceps, Staeg.). This species, like 
C. mtens has only 14-jointed antennae in the male. It 
seems to me that C. flaviceps, Staeg., is a synonym, but 
Winnertz definitely states that the antennae of male 
C. flaviceps are 16-jointed. The species (or the two species, 
if they are distinct) differ from all the other members of 
the genus found in Britain in having the palpi entirely 
yellow. The length of the fork of the fifth vein is very 
variable. 
C. semiflava, Staeg. This species is most easily known 
by the deep black basal palpal joint, the two apical joints 
being yellow. As stated by Winnertz, the male antennae 
are 16-jointed. This is much the rarest of the four British 
species known to me. 
C. crassicorns, Mg. ‘This common species may be 
known by the entirely dark blackish-grey thorax and palpi. 
I do not know C. brevicornis, Mg., but it is probable that 
the record of its occurrence in Britain really referred to 
C’. crassicornis. The species is under both names in the 
Verrall collection. 
List oF FIGURES. 
1. Bolitophila occlusa, sp. n. Hypopygium from above. x 50. 
2. An saundersi, Curt. Ha FA a 
3. Ceroplatus testaceus, Dalm. a3 3 Ba 
4. Ss - as Wing. <aico 
5. Platyura marginala, Mg. Hypopygium from above. x 29. 
6 es semirufa, Mg. 4 - Sealing 
rf se macrocera, sp. N. a x 50. 
8. ie “i * SS ,, below. ‘ 
Sasi zy - Wing. alice 
9: 53 biumbrata, sp. n. Hypopygium from below. x 50. 
10. sis nigricauda, Strobl. aA > above. S 
le 33 o) 55 » below. a 
1), aa flava, Meq. 3 » above. By 
13. 29 45 op 33 » below. 5 
14. i modesta, Winn. Pe » above. a 
15. % 1 ob 5 » below. is 
16. a dorsalis, Staeg. > » above. 3 
1(, sy 55 es * » below. Ks 
18. a arlriceps, sp. n. a a) ealbowe: 6 
