102 >IEW AUSTP.ALIAN ASILID.«, 



side of the segments; femora deep black above, light 

 yellow beneath ; tibiae light yellow, with apex black ; 

 wings h3'aline. 



Length . Male, 11 mm. 



Hah. Fern Tree Gully and AVarbnrton District, Vic- 

 toria. 



Male. Face jjale yellow ; moustache rather bushy, 

 the upper half black, lower half yellow. Antennge en- 

 tirely black, the first twO' jointsi bearing black hairs. 

 Front pale yellow-brown, the ocellar tubercle black. 

 Thorax pale yellow brown, with two closely adjacent dark 

 brown median stripes and two doubly-interrupted brown 

 side stripes ; thoracic bristles black, but a few short white 

 posterior ones may be present, those on the anterior 

 half of medium length (distinctly longer than in R. rusti- 

 canus), those on the posterior half very long ; sicutellum 

 grey, with two long black marginal bristles. Abdomen 

 deep black, with the hindmargins of segments jjale yellow- 

 brown, the yellow-bi'own coloui being carried forward 

 on each side of the segments, the whole bearing long, 

 slender, pale yellow hindmarginal bristles; genitalia 

 black, with black and yellow pubescence. Legs with 

 the femora deep black on upper surface, light yellow on 

 lower surface ; tibise light yellow with apex black ; tarsi 

 yellow-brown, with apices of joints black, the posterior 

 pair with the second to fifth joints almost entirely black ; 

 femora with long Avhite hair-like bristles below, and 

 stouter black apical and pre-apical bristles above; tibiai 

 and tarsi with both black and white bristles, the white 

 the longest, but the black predominating. Wings 

 slightly tinged with grey ; the cubital fork hardly con- 

 tracted, but considerably spread out as it joints the wing- 

 margin ; the second posterior cell not waved, and of 

 almost equal breadth throughout. Halteres brownish- 

 yellow. 



Variation. In the type and cotype, the white 

 thoracic bristles are small and inconspicuous, but in a 

 specimen from Warburton district, two of the long- 

 thoracic bristles are also white. 



This species is most easily identified by the colouring 

 of the legs, which are predominatingly light yellow, in- 

 stead of orange-brown, as in R. rusticanus, the line of 

 demarcation in the femora between this light yellow 

 colour and the dark upper surface being very distinct. 

 It. is further distinguished from R. rusticnniis by the pale 

 colour of the abdominal hindmargins being continued 

 forwards on each side of the segments, and by the long 

 yellow instead of short black hindmarginal bristles, also 



