cale2 Zl ae tae aa its pac 
nol TE 
/ 
Mr. F. W. Edwards on British Limnobiidae. 215 
rather dark-brown hair on the veins; the fringe very long, in the 
middle of the hind margin nearly half as long as the breadth of the 
wing, or slightly longer than the distance from vein Cu to the wing 
margin. Radial cross-vein thick, scarcely twice its own length 
distant from the base of R,. Basal section of R, +, vertical, 
practically in one straight line with 7-m, and about the same length. 
Cu,a reaching M before the fork (two specimens) or just beyond it 
(one specimen). Ax rather short and nearly straight, ending slightly 
but distinctly before the fork of Cu. Halteres ochreous. Length 
of body 2-5 mm.; wing 3-5 mm. 
This species, in venation, seems to connect the rather 
isolated M. murinus with the yellow group of species, 
but shows no trace of hairs on the wing-membrane. The 
peculiarities of venation, taken together, are probably 
sufficient to distinguish it from these latter species, though 
the venation is evidently subject to some variation. I 
took three females at Dreghorn, Ayrshire, 22 v. 1919. 
M. bihamatus Meij. I have seen only one British example 
of this species, a female in the British Museum from the 
New Forest (f. C. Adams). 
M. curvatus Tonn. I had intended to adopt Curtis’ 
name crassipes for this species, but since Tonnoir has pro- 
posed a new name for it, it will be better to use the one 
that is certain. I have taken it in Arran and at Llangollen ; 
it is also represented in the British Museum from the New 
Forest (Adams). Hypopygium, PI. I. fig. 13. 
M. occultus Meij. Brockenhurst (Verrall); Gidleigh, 
S.\Devon (F.W.E.); Rannoch (Grimshaw). 
M. gladius Meij. A single male from Oxton Bogs, 
Notts., 11 v. 1918 (Carr), presented by the collector to 
the British Museum; two more from Austwick, Yorks, 
7 vi. 20 (Cheetham). 
M. bifidus Goet. Superficially identical with the above 
three species, but with a very different hypopygium. 
The ventral (morphologically dorsal) plate of the aedoeagus 
is long, curved, and black, ending in a sharp point, and having 
at its base a pair of little black teeth (Pl. I. fig. 116). The 
lower clasper also has a slightly bifid tip. Probably 
common: Hitchin, Radwell and King’s Walden, Herts. ; 
Snailbeach, Salop (F.W.H.); Humberton Marshes, Grimsby 
(Dr. W. Wallace); Austwick, Yorks (Cheetham). 
M. appendiculatus Staej., M. armatus Meij., and M. medius 
Meij., are all common and are often found together. 
