- 
218 Mr. F. W. Edwards on British Limnobiidae. 
the hind tibia has dark pubescence except at the extreme base. 
Hind femora slender (somewhat clubbed apically in O. wneinata). 
Hypopygium (fig. 14) very distinct: the tenth tergite (or apical 
portion of the ninth) is elongate (as in O. nodulosa) and in the speci- 
mens examined bent at right angles to the ninth; both pairs of 
claspers'are horny, curved and sharp pointed, and there are also 
three horny sharp-pointed black processes on the aedoeagus. 
Stonesdale, Yorks, 22 y. 1920 (C. A. Cheetham); 2 3, 
type presented by the collector to the British Museum. 
0. similis Staeg. Mr. F. Jenkinson has taken several 
examples of this species at Logie, Elgin, viii. 1903 and 
ix. 1913. It seems to be somewhat larger than O. pseudo- 
similis, but apart from this and the difference in hypopygia 
there is little to distinguish the two. Lundstrém’s figure is 
not quite accurate; the terminal portion of the ninth 
tergite (morphologically the tenth) is really deeply divided 
in the middle as it is in O. nodulosa. 
O. pseudosimilis Lundst. A male in the British Museum 
named by Verrall R. similis, and taken by him at Inveran, 
is really O. pseudosimilis. A second male from the Clifton 
collection in the British Museum was probably taken near 
London; another from Crag Wood, Yorks, is m Mr. 
Cheetham’s collection. 
HELOBIA. 
This old name is now generally and correctly used in 
place of Symplecta. H. hybrida Mg. (the earlier and there- 
fore correct name for Symplecla punclipennis) seems to 
be a rare insect in Britain. The British Museum possesses 
a male from the Scilly Is. (collector unknown) and 
one female from Felden, Herts. (Piffard). There is a 
specimen from Cambridge (Jenkinson) in the Cambridge 
Museum; and I have recently found it in numbers at 
Shelford, Cambs. 
SYMPLECTOMORPHA. 
I consider that Kuntze and de Meijere are justified in 
reviving this name for Symplecta stictica and S. similis, 
and I further agree with de Meijere that these two are 
not specifically distinct. 
TRIMICRA. 
Kuntze in his paper on Palaearctic Eriopterinae attempts 
to distinguish three species of this genus: pilipes F., 
y = oa, ar 
ee. . 
a 
