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racquet-shaped scales. Wings with linear lateral scales, fork cells of equal 
breadth, first nearly twice as long as the second, its base nearer the wing 
base, its stem scarcely more than one-third the length of cell; posterior cross 
vein fully one-and-half times its own length from the median. Coxae pale 
ochraceous clad with pearly-white scales ; femora silvery beneath, above and 
at the sides clad with purple-brown scales; remainder of all legs purple 
scaled; ungues equal and simple. 
Abdomen .—Rich purple above, silvery beneath. A large triangular 
lateral spot present on either side of segments two, four and five, on segments 
six and seven the spot is more linear and extends more on the dorsum nearly 
meeting its fellow of the opposite side. 
Male .—The male differs in having a longer and more slender abdomen. 
The genitalia are complex. The inferior claspers are represented by a long 
thin chitinous rod. 
Occurrence .—The specimens were taken in jungle near Kuala Lumpur 
in the immediate neighbourhood of streams. 
Remarks .—Both the male and female when settled have a curious way 
of dancing up and down very characteristic of many tipulids but not 
common amongst mosquitoes. It is a very beautiful mosquito easily 
recognised from all the other Topomyias by the thoracic ornamentation the 
very large area of the head clad with white and the white scaled scutellum. 
It is the smallest member of the genus and perhaps one of the most 
distinct. 
Topomyia Decorabilis. 
Thorax dark brown, with a central line of ovoid almost circular 
pearly-white scales with mauve tints; silvery scaled shoulder patches, and 
dark bronze narrow scales elsewhere. Head with purple-black scales and 
very small lateral white spots. Palpi short. Proboscis rather long. 
Abdomen with purple dorsum triangular lateral patches and silvery venter. 
Male with very slender body. 
Female Head .—Head entirely covered with large broad spatulate purple- 
black scales which in oblique light become deep olive-green; on the vertex 
there is a small triangular patch which is in a fresh specimen silvery-white 
but in the type has become black because the scales no longer reflect light 
and simply take the colour of the background (it is still white in the male), 
on either side is a small patch of silvery scales adjoining the orbital 
margin; there are no upright scales; vertical bristles two in number, 
reddish-brown in colour; orbital bristles dark brown. Basal joint of 
antenna dark apricot with silvery tomentum, and with hairs but no scales 
on the inner face, second joint pale at the base, with a few black scales, 
black at the apex, remaining joints black, with black verticil late hairs. 
Clypeus dark chestnut-brown. Palpi very short about one-eight the length 
of the proboscis clad with black-brown scales. Proboscis rather long 
similarly clad. 
Thorax .—Prothoracic lobes deep black-brown, hinder surface clad with 
long spindle-shaped bluish-white scales. Mesontum dark brown clad for 
the most part with narrow-curved scales which under a hand lens are 
metallic-bronze, but under higher powers appear deep rich brown with 
