Mr. F. W. Edwards’ Notes on British Mycetophilidae. 347 
exhibits an intermediate venation, while in all other 
characters the species are essentially similar. 
PiatyurA, Mg. 
I have devoted considerable attention to this genus, 
having examined fully 300 British specimens in all, a large 
number considering the rarity of most of the species. There 
were 18 species represented; I give figures of the hypopygia 
of all these, except P. migriceps, Wlk., the male of which 
isunknowntome. Dr. H. Dziedzicki very kindly examined 
some of my drawings, and informs me that those of P. 
margunata, modesta, anfuscata, fasciata, unicolor, semirufa, 
and nemoralis correspond with Winnertz’s specimens which 
he has examined. 
There should be little difficulty about determining British 
specimens of Platyura by the following table :— 
1. R,+, ending in R, (Apemon, Joh.),. . . marginata, Me. 
he fs ONCE IM Costa a) ep hat a ay ee ae BS 
2. Anal vein reaching hind margin Gy ena uk Lies reebnl aa ete 
Anal vein not reaching hind margin hte ae wae ae UC 
3. Male antennae almost twice as long as head and thorax together ; 
front tibiae and metatarsi equal in length macrocera, sp. 1. 
Male antennae about as long as head and thorax together; 
front tibiae longer than the metatarsi : é : ee 
4. Wings with an obvious dark tip and a dark cloud on Cu, 
biumbrata, sp. n 
Wings quite unmarked, or with a small inconspicuous dark 
apical'spot . °.. oye ke Rte Tyrael Mag gee rome ELT 
5. Tip of Se well before base at R,;; small yellow species . . 6. 
Tip of Se level with or beyond base of R,; larger species . 8. 
6. Last two segments of male abdomen black  nigricauda, Strobl. 
Last two segments of male abdomen yellow Be as ee 
7. Tip of male wing with a small faint greyish spot (female wing 
clear) oe eC oo) EY: ell efit h ames So cue.  Evay McG. 
Wing of male quite clear. . . .  . modesta, Winn. 
8. Thorax black with yellow shoulders (normally) 
dorsalis, Staeg., Wlk. 
Thorax yellowish, with or without dark stripes .  . . 9% 
9. Thorax clear yellowish ; wings with a small grey spot at tip 
nigriceps, Wik, 
Thorax with three dark stripes; wings quite clear 
dorsalis, Staeg., var.; alriceps, sp. Nn. 
