Mr. F. W. Edwards on British Limnobiidae. 225 
Also a Scotch form. Arran (Ff. W. H.); Bonawe, Argyll 
(J. Waterston); Cromarty Point (W. R. O. Grant): in each 
case in company with the var. collina. 
(ec) Var. noy. noscibilis. Thorax dark brownish-grey; abdomen 
blackish; antennae generally pale at the base; stigma conspicuous 
and well defined, equally bisected by the radial cross-vein; cross- 
veins and base of Rs distinctly darkened; discal cell quite twice 
as long as broad; basal section of M, curved; cell M, as long as its 
petiole; Cu,a at from one-fourth to one-half of discal cell. Body 
length 7-9 mm. 
Widely distributed; the British Museum has specimens 
from Norfolk, Hants., Devon, N. Wales and Arran. 
Hexatoma (Anisomera). 
I can only recognise two species of this genus in Britain : 
H. fuscipennis (Curt.) (= Peronecera fuscipennis Curt., 
— Anisomera burmeisteri of the British list, and perhaps of 
Loew) with the antennae short in both sexes, and H. 
lucidipennis (Curt.), with long antennae in the male. I 
think the latter will probably prove specifically identical 
with nigra Latr., bicolor Mg., and aequalis Lw.; if so, 
Latreille’s name will have to replace Curtis’, The Kuropean 
species of this genus, however, require further study before 
their limits can be properly understood. 
DicrRANOTA and RHAPHIDOLABIS. 
The British species may be distinguished thus :— 
1. Radial cross-vein absent; only R, connecting R, and R, (genus 
Rhaphidolabis) (otherwise resembling D. subtilis) 
eaclusa Walk. (= coelebs Zett.). 
Radial cross-vein present, hence two veins connecting R, and 
R, (genus Dicranota) . ; j : . a kane 
2. Stigma faint or absent; antennae alike in the two sexes . 3. 
Stigma conspicuous; male antennae more or less elongate . 4. 
3. M, simple; first flagellar joint rather long A pavida Hal. 
M, forked; first flagellar joint nearly globular . subtilis Lw. 
4. A distinct dark spot over rm; M, usually simple; male 
abdomen largely reddish : guerint Zett. 
No dark spot over 7m, though the vein itself is darkened; M, 
always forked; male abdomen dark .  bimaculata Schum. 
D. subtilis Lw., is in the British Museum from Inchna- 
damph and Bettws-y-Coed (Verrall), and I have also seen 
it from Yorkshire (Cheetham). 
TRANS. ENT. SOC. LOND. 1921.—PARTS I, Il. (OCT.) Q 
