929 Mr. F. W. Rawal on British Limnobidae. 
basal joints of flagellum almost globular. Thorax almost uniformly 
dark greyish, the praescutum with two rather indistinct dark brown 
lines. Abdomen uniformly dark. Male hypopygium similar to 
that of J. apicata, but different in detail. Ninth tergite somewhat 
emarginate in the middle; side pieces without a trace of small 
teeth at the base; claspers (fig. 17a) much as in I. apicata (fig. 18a) 
but the black outer pair have a longer and sharper median tooth on 
the outer margin, and the outer half of the outer margin is more 
distinctly serrate; inner claspers short, almost oval; penis (fig. 17b) 
more than half as long as the side pieces (as in J. apicata, fig. 18b) 
but the basal plate is more elongate and pointed in the middle. 
Legs darker than in the allied species; femora pale at the base, 
gradually darkening towards the tips, which are almost black. 
Wings with a slightly smoky ground-colour, the base not conspicu- 
ously yellow. A small dark dot over the humeral cross-vein, and 
‘another over the cross-vein connecting Cu with An at the base. 
Five rather small dark spots along the costa, none of them extending 
much beyond R,, and all of them approximately equidistant: the 
first halfway between the humeral cross-vein and the base of Rs; 
the second over the base of Rs; the third over the apex of Sc; the 
fourth and-largest over 7-m and the apex of R,; the fifth over the 
apex of R,. Small dark clouds at the tips of.all the veins except R,_, ; 
a small dark spot before the tip of Ax; two or three along Rs; 
veins otherwise without dots, but all the cross-veins and R, , ; 
dark margined. The wings are rather narrow, alike in the two 
sexes; additional cross-vein below one-third of Rs; Cu,a at one- 
third of discal cell; Se ending slightly before the radial fork. 
Halteres pale yellow, with blackish knob. 
Length of body 5-7 mm.; wing 7 x 2 — 8 x 2:3 mm. 
Two specimens (3 Q) in the British Museum collected 
by J. C. Dale, without stated locality, but probably from 
Dorset; the female bearing the date 29 v. 1861. 
I. mundata Lw. ‘This is the species which has been 
recorded by Verrall as miliaria Egger. ‘The agreement with 
Loew’s description is perfect, but I agree with Loew that 
without the examination of Egger’s type the significance of 
his name is too doubtful to allow of its use in place of the 
well-distinguished mundata. The available evidence suggests 
that the two are not the same. Claspers, Pl. II. fig. 19. 
I, marmorata Me. ‘This species is extremely variable 
in wing-markings, but it can always be recognised by the 
unusual breadth of the male wing, the hind margin coming 
almost to a point just before the tip of vein Ax; this vein 
