( 245 ) 
chitinous rod with a fimbriated end attached to the outer angle on the ventral 
surface; and there is another process similar to this attached on the ventral 
surface of each lobe about half way from the base. 
Occurrence .—The specimens were taken at ‘‘The Gap in May. 
Remarks .—The male genitalia of this species differ so much from that 
of T. Nigra which in other respects it closely resembles that I feel sure it is 
a separate species. The female also differs by the much smaller scutellar 
spot and the paler coxae. 
Topomyia Nigra, n. sp. 
Head with a semi-circular patch of pearly-white scales on the vertex, a 
small patch of similar scales on either side, and black scales elsewhere. 
Thorax with central pearly-white stripe of flat scales and narrow curved 
scales over the rest of the mesonotum. Scutellum almost entirely clothed 
with white scales. Abdomen with silvery venter. Femora silvery beneath. 
Female Head.— Black; on the vertex is a semi-lunar patch of pearly- 
white racquet-shaped scales and low down on either side are a few white 
scales, elsewhere the head is clad with black flat scales and a few black 
upright scales behind. Basal joint of antenna black with silvery tomentum, 
remaining joints with a narrow white ring at base and apex ; verticillate 
hairs black. Palpi clad with black scales which in a good light shew violet 
reflections. Proboscis black scaled except on the ventral surface which is 
silvery. 
Thorax .—Prothoracic lobes black, clad above and behind with white 
racquet-shaped scales with a row of bristles in front. Mesonotum black 
(in a good light it is more of a brown) with a central stripe running the 
whole length composed of two rows of flat pearly-white almost circular 
scales and black (bronze under a hand lens) narrow-curved scales over the 
rest of its surface. Scutellum clad on the central lobe with pearly-white 
flat circular scales, on the lateral lobes with blackish-brown scales: the 
whole scutellum is covered there is no bare space between the lateral and 
central patch; bristles black. Pleura black or very dark brown clad with 
elliptical pearly scales. \\ ings densely clad with very dark brown scales, 
the lateral scales linear and towards the apex of the wing clavate but not 
markedly so ; first fork cell longer than second, its stem about one-third 
the length of the cell ; posterior cross vein nearly twice its own length 
from the median. Coxae dark brown with silvery scales ; femora, especially 
the hind, silvery scaled on the ventral face, above and laterally clad with 
dark brown scales fore and mid legs dark-brown ; ungues equal and simple. 
Abdomen .—With dark purple-brown scales above, glistening pearly- 
white scales below with a yellowish tinge in the dried specimens, no lateral 
spots. 
Male .—Male very black, without white spot on the scutellum, central 
thoracic stripe stops short before it reaches the base of the scutellum, the 
prothoracic lobes appear more prominent though this may be simply 
because the specimen is a better preserved one than the female. The 
genitalia consist of the usual parts in this genus. Ihe tuft of hairs on the 
end of the genital lobes is more spread out and much paler in colour than in 
