Genus Culex. 
11 
the lateral scales mostly long; first sub-marginal cell narrower 
but about the same length as the second posterior cell, its stem 
nearly as long as the cell, its base nearer the apex of the wing 
than the base of the second posterior cell, stem of the latter 
shorter than the cell and shorter than the stem of the former 
cell; supernumerary and mid cross-veins forming a slight obtuse 
angle with one another, the posterior cross-vein about two-thirds 
of its own length distant from the mid cross-vein ; fringe brown, 
with pale reflections along the inner border towards the base. 
Halteres ochraceous-brown, with a slightly fuscous knob, stem 
elongated and thin. 
Length .—6 to 7 mm.; with proboscis 11*5 mm. 
Habitat. —England. 
Time of capture .—June and September. 
Observations .—I have previously taken this species to be 
G. vexans, Meigen, but it can be separated from it by the fact 
that the ungues of the 9 are simple, not toothed. The descrip¬ 
tion is from a $ in Mr. Yerrall’s collection. 
A male specimen in the British Museum I feel sure is the 
male of this species, resembling those in Mr. Yerrall’s. collections. 
It also differs from the $ vexans in having two teeth to the 
larger unguis on the fore and mid legs. It is certainly a new 
species, but closely related to G. vexans, which I have so far been 
unable to find in England. 
55. Culex leucacanthus. Loew. 
(Beschr. Europ. Dipt. Dritter Bd. Halle (1873).) 
“ cf. Head of a pale brassy tint; antennae with blackish hairs, with 
whitish reflections ; palpi whitish with white reflections and also white 
reflections to the hairs. Thorax brassy yellow, with two ill-defined 
darker longitudinal streaks; pleurae spotted with snow-white; abdomen 
with black dorsum and basal white bands of equal size, with numerous 
pale yellow hairs. Legs with the femora whitish; knee spots white, the 
spots involving both sides of the joints; tarsi white-ringed, in the fore and 
mid legs on the bases and apices of the first (metatarsus) and second and 
on the base of the third joints, last joint white, thus making four bands; 
in the hind legs there are five white bands, the last joint being white, as 
in the fore and mid legs. Wings with the scales of the hind margin very 
characteristically white. 
Length .—If lines. 
Habitat. —Kasan. 
Time of capture. --Junc.” 
