1210 
DIPTERA OF AUSTRALIA, 
thorax and more than twice its length ; dorsal segments deep 
brown, with a more or less umber tinge, each segment with a 
narrow border of pale greyish-yellow posteriorly, densely clothed 
with tolerably long hairs, underneath whitish ; ovipositor and 
lamellse deep brown. Fore and intermediate coxae and femora 
pale greyish-yellow ; hind coxte dark brown ; hind femora pale 
greyish-yellow, deeply tipped with dark brown. Tibiie and spurs 
dusky-cinereous ; tarsi dai’ker than the tibiie, almost fuliginous 
in a certain light. In the fore-legs the tarsi more than twice the 
length ot the tibiie ; the tibiae somewhat longer than the meta- 
tarsus. Wings as long as the whole body, rounded off at the 
apex, almost hyaline, deeply clouded with blackish at the apex; 
brilliantly iridescent. Auxiliary vein running very close to the 
first longitudinal vein, disappearing before joining ; costal vein 
extending very little beyond the tip of the second longitudinal 
vein ; marginal cross-vein situated over the middle of the petiole 
of the third sub-marginal cell, and slightly before the base of the 
second posterior cell ; fifth short, distinct. 
Ilah. — Woronora, Illav/arra district (Skuse). September. 
Obs . — In Winnertz’s diagnosis of this genus, that author states 
that the terminal joint of the palpi is longer than the second and 
third taken together ; in this species the second and third joints 
are of almost equal length, the third sub-claviform, and the 
fourth about one-third longer than the third joint, slender, and 
also sub-claviform. 
166. Trichonta ill.etabilis, n.sp. 
(J. — Length of antenna? 0'060 inch ... L54 millimetres. 
Expanse of wings 0.110 xO'040 ... 2'79 x LOl 
Size of body O'lOOx 0*020 ... 2*51 x 0*50 
Antenuse slender, somewhat longer than the head and thorax 
together ; joints of the scapus and first two or three flagellar joints 
ochraceous, the I’emainder of the joints brown. Head dusky 
brown with minute golden-yellow hairs. Hypostoma and palpi 
ochraceous. Thorax dull greyish-brown, humeri deeply tipped 
