764 DIPTERA OF AUSTRALIA, 



reaching costa a short distance before origin of second longi- 

 tudinal vein ; sub-costal cross-vein situated before tip of auxiliary- 

 vein a distance rather shorter than the length of great cross-vein ; 

 first longitudinal vein pale towards its tip, abruptly arcuating 

 into second longitudinal at posterior end of stigma, joined to costa 

 by a short pale cross-vein ; prsefurca very angularly bent near its 

 base, Avith a short stump of a vein, and not twice the length of 

 distance between the origin of third longitudinal vein and small 

 cross-vein, in 9 only J longer than it ; discal cell closed, the 

 great cross-vein at its inner end. 



Hab.— Mount Kosciusko, N.S.W., 5000 feet; March (Helms). 

 Two sj^ecimens in Coll. Australian Museum. 



Ohs. — I have named this species after its discoverer, Mr. R. 

 Helms, a most enth^siastic and skilful collector, engaged by the 

 Trustees of the Australian Museum. 



293. DlCRANOMYIA OBSCURA, Sp.n. 



(J. — Length of antenna 0-030 inch 



Expanse of wings 0-270 x 0-0G5 



Size of body 0-180x0-030 



9. — Length of antennae...... 0-045 inch 



Expanse of wings 0-280x0-070 



Size of body 0-240 x 0-035 



0-76 millimetre. 

 6-85 X 1-66 

 4-56x0-76 



1-13 millimetres. 

 7-10x1-77 

 6-09 X 0-88 



Head brown, with a yellowish-grey ])loom ; rostrum, palpi and 

 antemife black. Thorax greyish-brown, dull, with three brov>^n 

 stripes ; intermediate stripe broad, extending from collare to trans- 

 verse suture ; lateral ones apparently not extending beyond the 

 suture ; plearse with a somewhat yellowish-grey bloom. Halteres 

 yellowish, the club usually infuscated. Abdomen more or less 

 dusky brown ; $ forceps and 9 ovipositor obscure testaceous. 

 Legs brown, the basal portion of femora ochreous or greyish- 

 tawny ; tip of tibiae, and the tarsal joints, infuscated. Wings 

 pellucid with a pale greyish tint, the stigma, cloudings on the 



