Mr. F. W. Edwards’ Notes on British Mycetophilidae. 351 
brown not confluent stripes; metanotum dark brown. Abdomen 
yellowish, the last segment and the genitalia (figs. 18 and 19) dark 
brown. Legs yellow, tarsi and tibial spurs dark brown. Front 
tibiae longer than the metatarsi. Wings quite unmarked, slightly 
yellowish tinged; halteres yellow. Apex of Sc opposite base of 
R,; R.+, long, at an angle of 45° with R,;;; distance between tips 
of R, and R,+, less than half that between tips of R,;, and R,+;; 
costa just reaching tip of wing and extending nearly half the 
distance between tips of R,+; and M,+,. Anal vein strong, 
reaching hind margin. 
One male from Goathorn, Dorset, 7. vi. 1907 (Lt.-Col. 
Yerbury). Type in Mr. Collin’s collection. This may be 
the species described by Winnertz as P. nigriceps, but it 
differs from Walker’s type in the venation (Sc is shorter 
and costa longer), in the absence of the dark spot at the 
apex of the wing, and in the striped thorax. 
P. semirufa, Mg. This is a common and very variable 
species, and seems to have been described under a variety 
of names. I have seen several varieties which at first 
sight appear quite distinct, but as they all have identical 
genitalia (fig. 6), and differ only in colour, I regard them 
all as one species : 
(a) Thorax and abdomen entirely black. This is the 
commonest form; the male has apparently been described 
by Van der Wulp as P. concolor, and is certainly Walker’s 
P. vilripennis. The female of this form (of the others 
I only know the male) has the wings rather deeply brownish- 
tinged, especially on the margins, being darkest on the 
anterior margin of the apical half. Females of this form 
have been described by Meigen as P. bawmhaueri, by Staeger 
as P. brunnipennis and by Walker as P. unicolor.  (Meigen’s 
P. baumhaueri, indeed, was described as 23 lines long, while 
the usual size is 4 lines, but this discrepancy signifies little, 
as the species varies areatly in this respect.) 
(6) Head and thorax black, abdomen red except at base 
and apex. P. semirufa, Mg., and probably P. erythrogaster, 
Mg., belong here. This form is also common. 
( :) Thorax dark reddish brown with two black stripes, 
abdomen reddish. 1 3, Crowborough (F.J.). Winnertz’s 
P. taeniata perhaps belongs here. 
(d) Like var. a, but a distinct dark fascia before the tip 
of the wing. Wells, Somerset (C.G.L.); Tram Inn, Here- 
fordshire (J W.Y.); Tarrington (J.H.W.). P. fulvipes, 
