BY ARTHUR WHITE. 21' 



Fig. 39. Wing of I ronoinyia ni^jromacuUita. 



Head broader than the thorax. Eyes ( ,^ ) joined from 

 the verteix to the antennae. Proboscis short, hardly pro- 

 jecting beyond the oral aperture. Palpi rounded, shorter 

 than the proboscis. Antennse very short, abcut one-fourth 

 the length of head, the first joint hardly distinguishable, 

 the second a little longer than broad, the third rounded, 

 and provided with a long, thread-like arista, which is ap- 

 jDarently jointed almost at its base, the arista, being about 

 twice the length of the three antennal joints together. 

 Thorax only slightly arched, with a few weak posterior 

 bristles; scatellum with weak marginal bristles. Abdomen 

 short, conical; male genitalia small and inconspicuous. 

 Legs short, the tibiie and tarsi of about equal 

 length, the tibiae thin at the base, but thickening grad- 

 ually to the apex; all joints practically bare; tarsal claws 

 unusually large, two well-developed pulvilli present, be- 

 tween which are three bristles of equal length. Wings 

 broad, the costa convex and serrated ; mediastinal vein 

 fused with the subcostal, which is lono- reachino- to the 

 sharply-defined stigma; radial vein unusually long, at first 

 well separated from the cubital, after which the two veins 

 converge, almost meeting below the stigma, and then 

 slightly diverge, reaching the margin close together a 

 little above the wing-tip ; cubital vein iinforked ; discal 

 cell long, emitting three velnlets; number of posterior 

 cells four ; the three basal cells short, the first a fraction 

 longer than the second, the third a little longer than 

 the first ; hind-angle of wing strongly developed. 



This remarkable sfenus may be disbino-uished at once 

 by its very unusual venation. Only one sjiecies is at pre- 

 sent known. 



Iroxomyia nigromaculata, Sp. nov. (Fig. 39.) 

 Thorax and scutellum black ; abdomen grey in centre, 



with a dorsal row of black spots, sides of abdomen black; 



femora black, with knees yellow ; tibiae yellow, with apex 



black, and a black ring near the base ; wings hyaline, with 



a clearly-defined yellow-brown stigma. 

 Length. Male, 4.5 mm. 

 Hab. Hobart. 



