Pie ORT ek, 
mye TS ae 5 = 
x 
Mr. F. W. Edwards on British Limnobiidae. 221 
entirely pale, or pale with blackish markings; male abdomen 
entirely blackish : : : etree 2 
2. Femora and tibiae yellow with black tips senies of female 
normal , 3 2 . fasciata L. 
Legs black, except aes a ferideia wings of female rudi- 
mentary . F ; .  pulchella Mg. 
3. Wings without dark ros, exeset over the cross-veins and 
at the base of Rs; male antennae longer than the thorax. 
trimaculata Zett. 
Wings with at least a few additional dark spots, including one 
near tip of Ax; male antennae shorter than the thorax . 4. 
4. Femora gradually darkened from base to tip; the dark spot 
at the tip of the costal cell almost equidistant from the one 
over the base of Rs and the one at the tip of R,; dark spot 
over humeral cross-vein minute. : : dalet sp. n. 
Femora yellow with blackish tips; the dark spot at the tip of the 
costal cell much nearer the one at the tip of R, than to the one 
over the base of Rs; humeral spot generally quite large . 5. 
. Wing-veins entirely without small dark dots, except at their 
tips 2 : ai Ge 
Wing-veins with at feash a fom dark dots gore ee in addition 
to the larger dark markings ’ onoat 
6. Wing-tip mostly dark, but basal half of Ree 5 rosie pale. 
apicata Lw. 
Wing-tip mostly pale, but R,,- uniformly dark-margined. 
mundata Lw. 
or 
7. Wing-veins with only a very few dark dots. 
marmorata var. verralli Bergr. 
Wing-veins with numerous dark dots. . marmorata Mg. 
I. fasciata L. There is a single specimen of this species, 
correctly named, in Stephens’ collection in the British 
Museum. Mr. C. A. Cheetham has taken it at Austwick, 
near Ingleboro, which is the only recent record I know of. 
I. trimaculata Zett. This species forms the connecting 
link between J. fasciata and I. marmorata, since although 
the male antennae are somewhat elongate and constructed 
as in I. fasciata, the outer clasper of the male hypopygium 
is flattened, black, and finely serrate on the outer edge as 
in the marmorata group. I. trimaculata is probably not 
uncommon in mountain districts; it was abundant at 
Taw Head, Dartmoor, in June 1920. 
I. dalei sp. n. (vide de Meijere, 1921) (Pl. II. fig. 17). 
Head dark grey, with a small black spot between the eyes. An- 
tennae entirely dark, alike in the two sexes, shorter than the thorax, 
