on either side of the second segment and a smaller triangular spot at 
the base of the fifth and the sixth segments. In the fresh specimen all the 
white scales have a beautiful pearly lustre and shew iridescent colours 
with changes of light. 
Male .—The median thoracic line does not run to the base of the 
scutellum but stops a short way from it. The patch of white scales 
on the middle lobe of the scutellum is much smaller than that on the 
scutellum of the female. The lateral spots are not present on the abdomen. 
The antenna and ungues are the same as in the female. The palpi are 
brilliant white and the proboscis is white beneath as in the female. The 
genitalia are very complex. There is a pair of inferior claspers shaped 
something like a two-pronged hay fork. The eighth segment is considerably 
enlarged from side to side. The lobes carrying the claspers are large 
convex outwards concave inwards. 
Occurrence .—A single female specimen only was caught by a stream in 
the jungle five miles from Kuala Lumpur, the male was taken at “The Gap” 
also by a stream. The female was captured in March the male in April. 
Remarks .—Resembles T. Argentoventrails, the white palpi however 
serving to distinguish it. Were it not for the marked difference of the male 
genitalia in the two species one would class it merely as a variety of the 
latter, but the above characteristic separates the two at once. Many species 
of the genus Aioretomyia can only be separated by the differences of the 
male genitalia. 
Topomyia Rubithoracis. n. sp. 
Head clad with purple-black broad spatulate scales a small patch of 
pearly-white scales on the vertex and a large patch on either side. Thorax 
reddish-brown with a central pearly stripe running the whole length and 
continued on to the scutellum. Dorsum of abdomen purple-brown, venter 
dull-white the two colours separated by a perfectly straight line. 
Female Head .—Clad with purple-black broad spatulate scales; on the 
vertex there is a very small pearly-white spot and on either side low down 
a large square patch of pearly-white scales not seen from above; vertical 
bristles absent but a few black orbital present. Basal joint of antenna black 
with a few silvery hairs, remaining joints dusky with short black verticillate 
hairs. Palpi very short clad like the proboscis with purple-black scales. 
Thorax .—Prothoracic lobes dark brown clad with broad elliptical silvery 
scales which may lose their lustre and colour when dry. Mesonotum 
variable, either light reddish-brown or dark chestnut; there is a central stripe 
of pearly almost circular flat scales composed of two rows, elsewhere the 
mesonotum is clad with bronze narrow-curved scales and patches of 
scales on the shoulder which take the colour of their background and are 
inconspicuous. Pleurae light brown, lighter than the mesonotum clad with 
silvery elliptical scales. Wings with small scales brown in colour, the 
lateral short and very narrow, the median small and clavate; fork cells of 
equal breadth, first about one-fifth longer than the second, the stem of the 
first is one-third the length of the cell; median cross vein shorter than 
either of the others; posterior cross vein distant from median its own length; 
spurious vein between fifth and sixth unusually well-marked in its whole length. 
