224 Mr. F. W. naw on British Limnobiudae. 
short and stout legs, and broad abdomen. Although there 
is no, trace of orange colour on the abdomen, I strongly 
suspect that it is nothing but the female of L. abdominalis ; 
the differences, however, are so considerable that this 
assumption cannot be made without proof. It is perhaps 
significant that L. abdominalis is known only from the male, 
L. robusta only from the female. 
L. leucophaea (Mg.) Meij. A small species somewhat 
resembling L. nemoralis, but with Sc, at the extreme tip of 
Se,. Oxton Bogs and Beauvale Woods, Notts. (Carr); Crag 
Wood, Yorks (Cheetham). 
L. nemoralis Mg. As already mentioned by Verrall, this 
species is exceedingly variable; the variations are so well 
marked that I should have no hesitation in regarding them 
as distinct species, if the hypopygium were not identical 
in all. The following five forms may be distinguished :— 
(a) Typical form. Thorax bluish-grey; abdomen somewhat 
ochreous; antennae generally yellow at the base; stigma rather 
faint and ill defined, two-thirds of it situate beyond the radial cross- 
vein; cross-veins quite clear; discal cell nearly twice as long as 
broad; basal section of M, (7. e. the upper of the two veins closing 
the discal cell) curved; cell M, not quite half as long as its petiole ; 
Cu,a at about two-fifths of discal cell. Body length 6-7-5 mm. 
This seems to be the commonest form in the South of 
England. 
(b) var. nov. minuscula. Thorax rather light grey, bluish tinge 
less distinct; antennae more or less pale at the base; stigma indis- 
tinguishable ; cross-veins quite clear; discal cell nearly or quite twice 
as long as broad; basal section of M., quite straight, and of the same 
length as the cross-vein m; cell M, not a third as long as its petiole ; 
Cu,a at about one-third of discal cell. Body length 4-5 mm. 
I have taken this at Bushy Heath and Knebworth, Herts. 
(c) Var. nov. collina. Thorax dark brownish-grey; abdomen 
blackish; antennae generally all black; stigma rather faint, equally 
bisected by the radial cross-vein; cross-veins quite clear; venation 
and size as in the typical form. ; 
Apparently the commonest form in Scotland; I have 
also taken it in North Wales. 
(d) Var. nov. quadrata. Like var. collina, but the discal cell is 
very little longer than broad, and Cu,a is situated exactly at its 
base. 
