r] 
204 Mr. F. W. fae on British Limnobiidae. 
colour, but of equal intensity) separated by a narrow paler ring. 
Wings resembling those of L. flavipes, but with the dark markings 
much less distinct ; in particular the spots round the apex of Sc and 
the base of Rs are smaller; on the other hand, there are in the upper 
basal cell between the base of the wing and the base of Rs two faint 
clouds instead of only one (these are scarcely perceptible in the 
Nottinghamshire specimens), and there is another faint cloud over 
the middle of Rs. The wing is narrower than in L. flavipes, and 
differs somewhat in venation: Rs and R, , , are even more nearly 
in a straight line than in L. flavipes, Rs being longer and straighter 
than in L. nubeculosa ; Cuya is about one-third of its length before 
the base of the discal-cell; and the discal cell is somewhat longer 
than in L, flavipes, the two veins at its apex both straight and equal 
in length. 
I took a male at Sandy, Beds., 10 v. 1910, and Prof. 
J. W. Carr has sent me a male and female taken at Wood- 
borough, Notts., 11 ix, 1920, by sweeping broom bushes. 
The museum also possesses two males from Victoria Park, 
Manchester (H. Britten) and one from Aberlady, 24 v. 
1904 (J. Waterston, pres. by A. E. J. Carter). 
Most of the points of difference mentioned above between 
this species and L. flavipes are given by Strobl for L. 
hercegoviniae. I should have considered the species to be 
the same as Strobl’s, had he not stated that (1) the wings 
are more spotted than in L. flavipes, almost identical with 
those of L. nubeculosa; and (2) the thorax has three 
shining blackish-brown stripes with two reddish-yellow 
triangles between them in front. This species is probably 
identical with L. hercegoviniae as identified by de Meijere 
(1921). 
L. masoni sp. n. 
Close to L. nigropunctata Schum., agreeing with it in antennae 
(structure and coloration) and wings (venation and markings), 
also in the structure of the hypopygium, but differing as follows :— 
Thorax much darker; praescutum entirely shining black, except for 
a small area on each side just in front of the suture; pleurae and 
postnotum dark brown. Abdomen, including hypopygium, shining 
black, with small yellowish areas at the base of the third and fourth 
tergites. Front femora resembling the others in having only a 
narrow black ring at the tip. 
I took a female in Dovedale, Derbyshire, 25 vi. 1911; 
there is a male in the British Museum from King’s Lynn, 
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