1204 
DIPTERA OF AUSTRALIA, 
extending more than half-way to the posterior margin ; a very 
short brown stump of a sixth longitudinal vein distinctly visiVde. 
Ilah . — Bowral (Masters). January, 
Genus 34. Trizygia, gen. nov. 
Head small, roundish-oval, flattened on the fore-part, situated 
deep in the thorax. Ocelli three, of almost equal size, arranged 
in a triangle on the front. Eyes ovate, a little emarginate on the 
inner side above. Palpi prominent, incurved, four- jointed, first 
and second joints short, of about equal length, third as long 
as the first and second united, fourth slender, about the length 
of the three preceding (PI. xxxii., fig. 12a), Antennie about 
the length of the head and thorax taken together, pro- 
jecting forwards, arcuated, 2- -t- 14-jointed, with a short downy 
pubescence ; joints of the scapus cupuliform, the second 
setose at the apex; flagellar joints cylindrical. Thorax ovate 
narrower and not so gibbose as in Aphelomera ; scutellum 
small, nearly semi-circular ; metathorax highly arched, not 
so high as in Apheloniera. Abdomen short, cylindrical, with 
six segments ; anal joint supporting the forceps longer and 
narrower than the terminal abdominal segment. Legs long, 
moderately robust ; femora compressed, the hind pair much larger 
and broader than the others; tibiie spurred, the intermediate and 
hind pairs with moderately long lateral spines, the former with a 
few spines on the inner side, and the hind pair with two distinct 
ranges on the outer side. Wings ovate, rounded oft' at the base, 
much shorter and more rounded than in Aphelomera, longer than 
the abdomen, microscopically pubescent, the minute hairs not all 
of one length as in Aphelomera, but of two lengths, the longer ones 
fewer than, and three or four times longer than the others.* 
Costal vein extending considerably beyond the tip of the second 
longitudinal vein, but ending far from the apex of the wing ; 
auxiliary vein ending in the costa beyond the marginal cross-vein. 
* The smaller pubescence is even more minute than the jjubescence on 
the wings of Aphdomtra. 
