21 
across the mesonotum and more or less on the scutellum, 
a short white line in front between these two, a white 
spot on each side of the thorax in front near the neck ; scutellum 
with a thick row of white scales and with three tufts of bristles ; 
metanotum brown ; pleurae dark brown with several patches 
of silvery scales. Abdomen dark brownish-black, with basal 
bands of white scales ; first segment densely clothed with creamy 
scales and edged with pale hairs ; sides with patches of white 
scales forming more or less flat triangular patches. Legs with 
the femora with the bases yellowish, dark scaled towards the 
apex, extreme tip pure white, ventral surface partly covered 
with white scales ; tibiae black ; metatarsi with basal white 
bands ; fore tarsi with the first joint basally white, rest black ; 
mid- tarsi the same ; hind tarsi all basally white, except the 
last joint, which is pure white, penultimate joint mostly white 
with black apex ; fore and mid ungues both toothed and hind 
without teeth. Wings with the veins clothed with very long 
narrow brown scales, and short median broad dark browm ones ; 
first sub-marginal cell longer and but slightly narrower than the 
second posterior cell, base of the former a little nearer the base 
of the wing than the latter ; posterior cross-vein about one and a 
half times to twice its length distant from the mid cross-vein. 
Halteres ochraceous, sometimes the knob is slightly fuscous. 
Length, 3.5 to 5 mm. 
$ . Darker than the ? . Head black, with white scales in 
front and in the middle ; antennae brown, with paler brown 
bands, sometimes almost white, basal joint jet black with a 
large tuft of pure white scales, plumes brown ; palpi black with 
four white basal bands ; proboscis black ; thorax marked as in 
the female, but much darker, and the white scales clearer and 
more silvery. Abdomen with the first segment with creamy 
scales, bases of the second to fifth segments white, fifth to eighth 
with clear white lateral spots ; these spots also occur on the 
front segments, but quite at the sides. Legs as in the female. 
Fore claws unequal, the larger one with a short blunt tooth, 
smaller one untoothed ; mid ungues unequal, untoothed ; hind 
equal, untoothed. 
Length, 3 to 4.5 mm. 
This species is subject to very considerable variation, both in 
size and in colour of scales ; it is known as the " Tiger mosquito " 
plentiful about habitations throughout the world, in warm 
latitudes. It oviposits singly, the larvae are found in as- 
sociation with those of Culex fatigans in small collections of 
water in or near habitations ; it is a most annoying insect, biting 
in the house in the day time, more particularly ; present and 
biting throughout the year in Brisbane ; it is an introduced 
species and never goes wild ; it is the intermediary host for 
the Yellow Fever parasite and possibly also for Dengue Fever. 
