210 Mr. F. -W. Rdwawe on British Limnobiidae. 
EMPEDA. 
I prefer to regard Hmpeda, and the other groups allied 
to Eriopltera, as distinct genera, as has been done by most 
European writers, though not by Osten-Sacken and 
Alexander, the two leading authorities on this group in 
America. Rondani’s Ilisophila has been quoted as the 
same as Hmpeda, and his diagnosis certainly suggests that 
this may be so, but he gives “ Hrioptera lutea Me.” ” as the 
type, therefore his name can hardly be adopted. 
ILISIA. 
Rondani’s name Jlisia must take the place of Osten- 
Sacken’s Acyphona. We have two British species, the 
common J. maculata with spotted wings, and the rarer 
I. areolata Siebke, with plain wings and very small discal 
cell. The latter occurs at Glasgow (Henderson, Brit. Ass. 
Handb. Nat. Hist. Glasgow, 1901, p. 268); Rocester, Staffs. 
(F. W. E.); Shotover, Oxford (Hamm); Farnley, Leeds 
(Cheetham) ; Midlothian (A. #..J. Carter, Ent. Mo. Mag., 1913). 
ERIOPTERA (s. str.). 
1. Wing-veins inconspicuously hairy towards apex only; dark 
species; thorax with a narrow black central line. oe P43 
Wing-veins conspicuously hairy for almost their entirelength 3. 
. Larger species; wings broader; discal cell usually closed ; wings 
clear : ; : 5 : trivialis Mg. 
Smaller species ; wings narrower ; “ieee cell usually open; cross- 
veins often more or less clouded, sometimes also a cloud 
bo 
below tip of R, ; : . diuturna Walk. 
3. A distinct iowa A dose aides dice half of costa; legs pale 
yellow 4 : : ; ‘ c ; limbata Lw. 
Wings unicolorous . : : : : : Sp ae 
4. Pale yellow species : : : : ranos 
Brownish ochreous to isch ee n species 6 
5. Palpi black; eyes very large, almost touching in the ate 
macrophthalma Lw. 
Palpi brown; eyes much smaller, widely separated in both 
Sexes ‘ ; : : flavescens Mg.; meijeret sp.n. 
6. Blackish-brown speci.s . : : fuscipennis Mg. 
Ochreous species, at least with apuoaue pleurae : Rieti 
. Knob of haltere blackish, stem very pale; mesonotum darkened 
in the middle. : Z taenionota Mg.; minor Meij. 
Knob of halteres scarcely darker than the stem, which is less 
pale; mesonotum not darkened in middle. ‘ se RSs 
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