1172 
DIPTERA OF AUSTRALIA, 
irregular, extending each side of the tip of the anterior branch of 
the fourth longitudinal vein at the wing margin, the two last 
spots are inclined to coalesce ; a brown line under the fourth 
longitudinal terminates on the posterior margin in a pale brown 
spot, which also envelopes the tip of the fifth longitudinal. Costal 
vein extending beyond the junction with the second longitudinal 
one-third of the distance from that to the tip of the anterior branch 
of the third longitudinal ; anterior branch of the second longi- 
tudinal at an angle of 45°, its base situated at a point one-fourth 
the distance from the tip of the first longitudinal vein to the tip 
of the second longitudinal ; marginal cross- vein slender at its 
basal half ; rudimentary sixth longitudinal vein wanting. 
Hah . — Sydney (Skuse). May. 
Tar. jS. — A. 9 specimen differs from the above in having the 
coxie ferruginous-ochraceous, the femora yellowish, the intermediate 
and hind pairs being marked at the base in the front only, the 
tibiae and tarsi not so dark, the tibial spurs not so long and the 
two middle spots on the apical portion of the wing coalescent, but 
I cannot detect any deviations that would in my estimation raise 
it above the rank of a variety. 
Hah . — Middle Harbour (Skuse). September. 
Ohs . — Individuals of this species may vary considerably, only 
these two have come under my notice. 
145. Platyura fenestralis, sp.n. (PL xxxi., fig. 5). 
— Length of antennae O'OSO inch 
E.xpanse of wings 0‘150x0'055 ... 
Size of body 0‘210 x O'OSO ... 
2 '02 millimetres. 
3-81 X 1-39 
5-33 X 0-76 
2- — Length of antennae 0'055 inch 
Expanse of wings 0'180x0'070 ... 
Size of body 0'230 x 0'047 ... 
1'39 millimetres. 
4- 56 X 1-77 
5- 84 X 1-23 
(J. — Antennae rather more than one-third the length of the body; 
in the 9 about as long as the thorax ; joints of the scapus and 
